21851275560 has 64 divisors (see below), whose sum is σ = 66133990080. Its totient is φ = 5775436800.

The previous prime is 21851275541. The next prime is 21851275591. The reversal of 21851275560 is 6557215812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 792166 + ... + 819285.

It is an arithmetic number, because the mean of its divisors is an integer number (1033343595).

Almost surely, 2^21851275560 is an apocalyptic number.

21851275560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21851275560 is an abundant number, since it is smaller than the sum of its proper divisors (44282714520).

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

21851275560 is a wasteful number, since it uses less digits than its factorization.

21851275560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1611578 (or 1611574 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 42.

The spelling of 21851275560 in words is "twenty-one billion, eight hundred fifty-one million, two hundred seventy-five thousand, five hundred sixty".