21305522260 has 48 divisors (see below), whose sum is σ = 48839656320. Its totient is φ = 7742599040.

The previous prime is 21305522239. The next prime is 21305522261. The reversal of 21305522260 is 6222550312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21305522261) 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, 330561 + ... + 389719.

It is an arithmetic number, because the mean of its divisors is an integer number (1017492840).

Almost surely, 2^21305522260 is an apocalyptic number.

21305522260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21305522260 is an abundant number, since it is smaller than the sum of its proper divisors (27534134060).

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

21305522260 is a wasteful number, since it uses less digits than its factorization.

21305522260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60816 (or 60814 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The spelling of 21305522260 in words is "twenty-one billion, three hundred five million, five hundred twenty-two thousand, two hundred sixty".