21503230512 has 40 divisors (see below), whose sum is σ = 55747734000. Its totient is φ = 7142231040.

The previous prime is 21503230501. The next prime is 21503230523.

It is a happy number.

21503230512 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (21503230501) and next prime (21503230523).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 783637 + ... + 810612.

It is an arithmetic number, because the mean of its divisors is an integer number (1393693350).

Almost surely, 2^21503230512 is an apocalyptic number.

It is an amenable number.

21503230512 is an abundant number, since it is smaller than the sum of its proper divisors (34244503488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21503230512 is a wasteful number, since it uses less digits than its factorization.

21503230512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1594541 (or 1594535 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The spelling of 21503230512 in words is "twenty-one billion, five hundred three million, two hundred thirty thousand, five hundred twelve".