21357132512 has 24 divisors (see below), whose sum is σ = 42085604736. Its totient is φ = 10668724992.

The previous prime is 21357132481. The next prime is 21357132541. The reversal of 21357132512 is 21523175312.

It is a super-2 number, since 2×21357132512² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272213 + ... + 341780.

It is an arithmetic number, because the mean of its divisors is an integer number (1753566864).

Almost surely, 2^21357132512 is an apocalyptic number.

It is an amenable number.

21357132512 is a deficient number, since it is larger than the sum of its proper divisors (20728472224).

21357132512 is a wasteful number, since it uses less digits than its factorization.

21357132512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615090 (or 615082 counting only the distinct ones).

The product of its digits is 12600, while the sum is 32.

The spelling of 21357132512 in words is "twenty-one billion, three hundred fifty-seven million, one hundred thirty-two thousand, five hundred twelve".