21566562260 has 48 divisors (see below), whose sum is σ = 47294706816. Its totient is φ = 8245302912.

The previous prime is 21566562247. The next prime is 21566562301. The reversal of 21566562260 is 6226566512.

It is a super-3 number, since 3×21566562260³ (a number of 32 digits) contains 333 as substring.

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, 614507 + ... + 648653.

It is an arithmetic number, because the mean of its divisors is an integer number (985306392).

Almost surely, 2^21566562260 is an apocalyptic number.

21566562260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21566562260 is an abundant number, since it is smaller than the sum of its proper divisors (25728144556).

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

21566562260 is a wasteful number, since it uses less digits than its factorization.

21566562260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35552 (or 35550 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 21566562260 in words is "twenty-one billion, five hundred sixty-six million, five hundred sixty-two thousand, two hundred sixty".