23121505645 has 32 divisors (see below), whose sum is σ = 32074986240. Its totient is φ = 15672683520.

The previous prime is 23121505637. The next prime is 23121505679. The reversal of 23121505645 is 54650512132.

It is not a de Polignac number, because 23121505645 - 2³ = 23121505637 is a prime.

It is a super-3 number, since 3×23121505645³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23121505645.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1683205 + ... + 1696885.

It is an arithmetic number, because the mean of its divisors is an integer number (1002343320).

Almost surely, 2^23121505645 is an apocalyptic number.

It is an amenable number.

23121505645 is a deficient number, since it is larger than the sum of its proper divisors (8953480595).

23121505645 is a wasteful number, since it uses less digits than its factorization.

23121505645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14245.

The product of its (nonzero) digits is 36000, while the sum is 34.

The spelling of 23121505645 in words is "twenty-three billion, one hundred twenty-one million, five hundred five thousand, six hundred forty-five".