23431200121 has 16 divisors (see below), whose sum is σ = 28193909760. Its totient is φ = 19022789520.

The previous prime is 23431200059. The next prime is 23431200137. The reversal of 23431200121 is 12100213432.

It is a happy number.

It is not a de Polignac number, because 23431200121 - 2⁷ = 23431199993 is a prime.

It is a super-2 number, since 2×23431200121² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23431200421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 716436 + ... + 748426.

It is an arithmetic number, because the mean of its divisors is an integer number (1762119360).

Almost surely, 2^23431200121 is an apocalyptic number.

It is an amenable number.

23431200121 is a deficient number, since it is larger than the sum of its proper divisors (4762709639).

23431200121 is a wasteful number, since it uses less digits than its factorization.

23431200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37524.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 23431200121 its reverse (12100213432), we get a palindrome (35531413553).

The spelling of 23431200121 in words is "twenty-three billion, four hundred thirty-one million, two hundred thousand, one hundred twenty-one".