21056420553260 has 12 divisors (see below), whose sum is σ = 44218483161888. Its totient is φ = 8422568221296.

The previous prime is 21056420553251. The next prime is 21056420553263. The reversal of 21056420553260 is 6235502465012.

It is not an unprimeable number, because it can be changed into a prime (21056420553263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526410513812 + ... + 526410513851.

It is an arithmetic number, because the mean of its divisors is an integer number (3684873596824).

Almost surely, 2^{21056420553260} is an apocalyptic number.

21056420553260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21056420553260 is an abundant number, since it is smaller than the sum of its proper divisors (23162062608628).

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

21056420553260 is a wasteful number, since it uses less digits than its factorization.

21056420553260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052821027672 (or 1052821027670 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 41.

The spelling of 21056420553260 in words is "twenty-one trillion, fifty-six billion, four hundred twenty million, five hundred fifty-three thousand, two hundred sixty".