21250456040544 has 96 divisors (see below), whose sum is σ = 58212996226560. Its totient is φ = 6774899484672.

The previous prime is 21250456040533. The next prime is 21250456040549. The reversal of 21250456040544 is 44504065405212.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 21250456040496 and 21250456040505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250456040549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24495352 + ... + 25348040.

It is an arithmetic number, because the mean of its divisors is an integer number (606385377360).

Almost surely, 2^{21250456040544} is an apocalyptic number.

21250456040544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21250456040544 is an abundant number, since it is smaller than the sum of its proper divisors (36962540186016).

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

21250456040544 is a wasteful number, since it uses less digits than its factorization.

21250456040544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864012 (or 864004 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 42.

The spelling of 21250456040544 in words is "twenty-one trillion, two hundred fifty billion, four hundred fifty-six million, forty thousand, five hundred forty-four".