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1221221122201 = 2415067307561
BaseRepresentation
bin10001110001010110011…
…100111000000010011001
311022202011222222210222101
4101301112130320002121
5130002030101402301
62333004330523401
7154141666156663
oct21612634700231
94282158883871
101221221122201
11430a0a539313
12178820596561
138b211c70c52
1443170a7b533
1521b77c65701
hex11c56738099

1221221122201 has 4 divisors (see below), whose sum is σ = 1226288430004. Its totient is φ = 1216153814400.

The previous prime is 1221221122193. The next prime is 1221221122207. The reversal of 1221221122201 is 1022211221221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 884118956176 + 337102166025 = 940276^2 + 580605^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221221122201 - 23 = 1221221122193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221221122207) 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, 2533653540 + ... + 2533654021.

It is an arithmetic number, because the mean of its divisors is an integer number (306572107501).

Almost surely, 21221221122201 is an apocalyptic number.

It is an amenable number.

1221221122201 is a deficient number, since it is larger than the sum of its proper divisors (5067307803).

1221221122201 is an equidigital number, since it uses as much as digits as its factorization.

1221221122201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5067307802.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1221221122201 its reverse (1022211221221), we get a palindrome (2243432343422).

The spelling of 1221221122201 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred one".

Divisors: 1 241 5067307561 1221221122201