21330502512 has 80 divisors (see below), whose sum is σ = 60141650688. Its totient is φ = 6460733440.

The previous prime is 21330502489. The next prime is 21330502561. The reversal of 21330502512 is 21520503312.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1271008 + ... + 1287680.

Almost surely, 2^21330502512 is an apocalyptic number.

21330502512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21330502512 is an abundant number, since it is smaller than the sum of its proper divisors (38811148176).

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

21330502512 is a wasteful number, since it uses less digits than its factorization.

21330502512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19118 (or 19112 counting only the distinct ones).

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

The spelling of 21330502512 in words is "twenty-one billion, three hundred thirty million, five hundred two thousand, five hundred twelve".