21373522512 has 20 divisors (see below), whose sum is σ = 55214933280. Its totient is φ = 7124507488.

The previous prime is 21373522439. The next prime is 21373522519. The reversal of 21373522512 is 21522537312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21373522519) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 222640812 + ... + 222640907.

It is an arithmetic number, because the mean of its divisors is an integer number (2760746664).

Almost surely, 2^21373522512 is an apocalyptic number.

It is an amenable number.

21373522512 is an abundant number, since it is smaller than the sum of its proper divisors (33841410768).

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

21373522512 is a wasteful number, since it uses less digits than its factorization.

21373522512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445281730 (or 445281724 counting only the distinct ones).

The product of its digits is 25200, while the sum is 33.

The spelling of 21373522512 in words is "twenty-one billion, three hundred seventy-three million, five hundred twenty-two thousand, five hundred twelve".