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101221100021 = 215994686379
BaseRepresentation
bin101111001000100111…
…1110110100111110101
3100200021021100122120102
41132101033312213311
53124300100200041
6114300023243445
710212232103606
oct1362117664765
9320237318512
10101221100021
1139a22743678
121774a8a9585
1397117b0c32
144c832c3dad
15297654209b
hex17913f69f5

101221100021 has 4 divisors (see below), whose sum is σ = 101225808000. Its totient is φ = 101216392044.

The previous prime is 101221099999. The next prime is 101221100027. The reversal of 101221100021 is 120001122101.

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-101221100021 is a prime.

It is a super-2 number, since 2×1012211000212 (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101221099975 and 101221100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101221100027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2321591 + ... + 2364788.

It is an arithmetic number, because the mean of its divisors is an integer number (25306452000).

Almost surely, 2101221100021 is an apocalyptic number.

It is an amenable number.

101221100021 is a deficient number, since it is larger than the sum of its proper divisors (4707979).

101221100021 is an equidigital number, since it uses as much as digits as its factorization.

101221100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4707978.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 101221100021 its reverse (120001122101), we get a palindrome (221222222122).

The spelling of 101221100021 in words is "one hundred one billion, two hundred twenty-one million, one hundred thousand, twenty-one".

Divisors: 1 21599 4686379 101221100021