21345164512 has 48 divisors (see below), whose sum is σ = 48036627072. Its totient is φ = 9146021760.

The previous prime is 21345164443. The next prime is 21345164549. The reversal of 21345164512 is 21546154312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1813687 + ... + 1825417.

It is an arithmetic number, because the mean of its divisors is an integer number (1000763064).

Almost surely, 2^21345164512 is an apocalyptic number.

It is an amenable number.

21345164512 is an abundant number, since it is smaller than the sum of its proper divisors (26691462560).

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

21345164512 is a wasteful number, since it uses less digits than its factorization.

21345164512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19871 (or 19863 counting only the distinct ones).

The product of its digits is 28800, while the sum is 34.

The spelling of 21345164512 in words is "twenty-one billion, three hundred forty-five million, one hundred sixty-four thousand, five hundred twelve".