21285764092 has 24 divisors (see below), whose sum is σ = 38878350336. Its totient is φ = 10177871088.

The previous prime is 21285764089. The next prime is 21285764131. The reversal of 21285764092 is 29046758212.

It is a Harshad number since it is a multiple of its sum of digits (46).

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, 431353 + ... + 478159.

It is an arithmetic number, because the mean of its divisors is an integer number (1619931264).

Almost surely, 2^21285764092 is an apocalyptic number.

It is an amenable number.

21285764092 is a deficient number, since it is larger than the sum of its proper divisors (17592586244).

21285764092 is a wasteful number, since it uses less digits than its factorization.

21285764092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51777 (or 51775 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 21285764092 in words is "twenty-one billion, two hundred eighty-five million, seven hundred sixty-four thousand, ninety-two".