21285474758 has 32 divisors (see below), whose sum is σ = 33520650240. Its totient is φ = 10124585280.

The previous prime is 21285474709. The next prime is 21285474779. The reversal of 21285474758 is 85747458212.

It is a congruent number.

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, 1381823 + ... + 1397141.

It is an arithmetic number, because the mean of its divisors is an integer number (1047520320).

Almost surely, 2^21285474758 is an apocalyptic number.

21285474758 is a deficient number, since it is larger than the sum of its proper divisors (12235175482).

21285474758 is a wasteful number, since it uses less digits than its factorization.

21285474758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15732.

The product of its digits is 5017600, while the sum is 53.

The spelling of 21285474758 in words is "twenty-one billion, two hundred eighty-five million, four hundred seventy-four thousand, seven hundred fifty-eight".