21156645560160 has 192 divisors, whose sum is σ = 72917666325504. Its totient is φ = 5113664102400.

The previous prime is 21156645560143. The next prime is 21156645560177. The reversal of 21156645560160 is 6106554665112.

It is an interprime number because it is at equal distance from previous prime (21156645560143) and next prime (21156645560177).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4165656 + ... + 7724375.

It is an arithmetic number, because the mean of its divisors is an integer number (379779512112).

Almost surely, 2^{21156645560160} is an apocalyptic number.

21156645560160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21156645560160 is an abundant number, since it is smaller than the sum of its proper divisors (51761020765344).

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

21156645560160 is a wasteful number, since it uses less digits than its factorization.

21156645560160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11890397 (or 11890389 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 48.

The spelling of 21156645560160 in words is "twenty-one trillion, one hundred fifty-six billion, six hundred forty-five million, five hundred sixty thousand, one hundred sixty".