23115522121 has 8 divisors (see below), whose sum is σ = 23258291400. Its totient is φ = 22973174400.

The previous prime is 23115522109. The next prime is 23115522139. The reversal of 23115522121 is 12122551132.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 514609225 + 22600912896 = 22685^2 + 150336^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23115522121 - 2¹⁷ = 23115391049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23115622121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4971 + ... + 215071.

It is an arithmetic number, because the mean of its divisors is an integer number (2907286425).

Almost surely, 2^23115522121 is an apocalyptic number.

It is an amenable number.

23115522121 is a deficient number, since it is larger than the sum of its proper divisors (142769279).

23115522121 is a wasteful number, since it uses less digits than its factorization.

23115522121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210779.

The product of its digits is 1200, while the sum is 25.

The spelling of 23115522121 in words is "twenty-three billion, one hundred fifteen million, five hundred twenty-two thousand, one hundred twenty-one".