23121744985 has 16 divisors (see below), whose sum is σ = 28043937936. Its totient is φ = 18298994688.

The previous prime is 23121744949. The next prime is 23121745013. The reversal of 23121744985 is 58944712132.

It can be written as a sum of positive squares in 8 ways, for example, as 2812074841 + 20309670144 = 53029^2 + 142512^2 .

It is a cyclic number.

It is not a de Polignac number, because 23121744985 - 2⁷ = 23121744857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1326547 + ... + 1343863.

It is an arithmetic number, because the mean of its divisors is an integer number (1752746121).

Almost surely, 2^23121744985 is an apocalyptic number.

It is an amenable number.

23121744985 is a deficient number, since it is larger than the sum of its proper divisors (4922192951).

23121744985 is a wasteful number, since it uses less digits than its factorization.

23121744985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20172.

The product of its digits is 483840, while the sum is 46.

The spelling of 23121744985 in words is "twenty-three billion, one hundred twenty-one million, seven hundred forty-four thousand, nine hundred eighty-five".