21295858590 has 48 divisors (see below), whose sum is σ = 55991379600. Its totient is φ = 5615085696.

The previous prime is 21295858589. The next prime is 21295858613. The reversal of 21295858590 is 9585859212.

21295858590 is a `hidden beast` number, since 2 + 1 + 2 + 9 + 58 + 585 + 9 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1321320 + ... + 1337339.

It is an arithmetic number, because the mean of its divisors is an integer number (1166487075).

Almost surely, 2^21295858590 is an apocalyptic number.

21295858590 is an abundant number, since it is smaller than the sum of its proper divisors (34695521010).

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

21295858590 is a wasteful number, since it uses less digits than its factorization.

21295858590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2658761 (or 2658758 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 54.

The spelling of 21295858590 in words is "twenty-one billion, two hundred ninety-five million, eight hundred fifty-eight thousand, five hundred ninety".