21056545156000 has 96 divisors (see below), whose sum is σ = 53519929379280. Its totient is φ = 8132182912000.

The previous prime is 21056545155973. The next prime is 21056545156021. The reversal of 21056545156000 is 65154565012.

It can be written as a sum of positive squares in 8 ways, for example, as 292884451344 + 20763660704656 = 541188^2 + 4556716^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90644971 + ... + 90876970.

Almost surely, 2^{21056545156000} is an apocalyptic number.

21056545156000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21056545156000 is an abundant number, since it is smaller than the sum of its proper divisors (32463384223280).

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

21056545156000 is a wasteful number, since it uses less digits than its factorization.

21056545156000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181521995 (or 181521977 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 40.

The spelling of 21056545156000 in words is "twenty-one trillion, fifty-six billion, five hundred forty-five million, one hundred fifty-six thousand".