21306554560 has 56 divisors (see below), whose sum is σ = 50760904320. Its totient is φ = 8518477824.

The previous prime is 21306554557. The next prime is 21306554561. The reversal of 21306554560 is 6545560312.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21306554561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 691156 + ... + 721324.

It is an arithmetic number, because the mean of its divisors is an integer number (906444720).

Almost surely, 2^21306554560 is an apocalyptic number.

21306554560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21306554560 is an abundant number, since it is smaller than the sum of its proper divisors (29454349760).

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

21306554560 is a wasteful number, since it uses less digits than its factorization.

21306554560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32393 (or 32383 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 37.

The spelling of 21306554560 in words is "twenty-one billion, three hundred six million, five hundred fifty-four thousand, five hundred sixty".