21205150764 has 48 divisors (see below), whose sum is σ = 56561422848. Its totient is φ = 6057076608.

The previous prime is 21205150739. The next prime is 21205150781. The reversal of 21205150764 is 46705150212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324297 + ... + 384159.

It is an arithmetic number, because the mean of its divisors is an integer number (1178362976).

Almost surely, 2^21205150764 is an apocalyptic number.

It is an amenable number.

21205150764 is an abundant number, since it is smaller than the sum of its proper divisors (35356272084).

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

21205150764 is a wasteful number, since it uses less digits than its factorization.

21205150764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64094 (or 64092 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The spelling of 21205150764 in words is "twenty-one billion, two hundred five million, one hundred fifty thousand, seven hundred sixty-four".