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221220100221221 = 1271741890552923
BaseRepresentation
bin110010010011001011010001…
…011111011010100100100101
31002000021102202010220201010102
4302103023101133122210211
5212443432231124034341
62102255035553433445
764411424211162503
oct6223132137324445
91060242663821112
10221220100221221
116453aa10419152
1220989b2bb6b885
139658c7322562a
143c8b177add673
151a89698576c9b
hexc932d17da925

221220100221221 has 4 divisors (see below), whose sum is σ = 222961990774272. Its totient is φ = 219478209668172.

The previous prime is 221220100221191. The next prime is 221220100221277. The reversal of 221220100221221 is 122122001022122.

221220100221221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-221220100221221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221220100221193 and 221220100221202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220100221521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 870945276335 + ... + 870945276588.

It is an arithmetic number, because the mean of its divisors is an integer number (55740497693568).

Almost surely, 2221220100221221 is an apocalyptic number.

It is an amenable number.

221220100221221 is a deficient number, since it is larger than the sum of its proper divisors (1741890553051).

221220100221221 is a wasteful number, since it uses less digits than its factorization.

221220100221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1741890553050.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221220100221221 its reverse (122122001022122), we get a palindrome (343342101243343).

The spelling of 221220100221221 in words is "two hundred twenty-one trillion, two hundred twenty billion, one hundred million, two hundred twenty-one thousand, two hundred twenty-one".

Divisors: 1 127 1741890552923 221220100221221