21026394852 has 48 divisors (see below), whose sum is σ = 52258711680. Its totient is φ = 6557005312.

The previous prime is 21026394799. The next prime is 21026394853. The reversal of 21026394852 is 25849362012.

It is not an unprimeable number, because it can be changed into a prime (21026394853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274527 + ... + 342662.

It is an arithmetic number, because the mean of its divisors is an integer number (1088723160).

Almost surely, 2^21026394852 is an apocalyptic number.

It is an amenable number.

21026394852 is an abundant number, since it is smaller than the sum of its proper divisors (31232316828).

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

21026394852 is a wasteful number, since it uses less digits than its factorization.

21026394852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617380 (or 617378 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 21026394852 in words is "twenty-one billion, twenty-six million, three hundred ninety-four thousand, eight hundred fifty-two".