21250641434456 has 128 divisors (see below), whose sum is σ = 47401555829760. Its totient is φ = 8742638016000.

The previous prime is 21250641434447. The next prime is 21250641434471. The reversal of 21250641434456 is 65443414605212.

It is a super-2 number, since 2×21250641434456² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21250641434456.

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, 54000806 + ... + 54392906.

It is an arithmetic number, because the mean of its divisors is an integer number (370324654920).

Almost surely, 2^{21250641434456} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21250641434456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23700777914880).

21250641434456 is an abundant number, since it is smaller than the sum of its proper divisors (26150914395304).

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

21250641434456 is a wasteful number, since it uses less digits than its factorization.

21250641434456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392545 (or 392541 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 47.

The spelling of 21250641434456 in words is "twenty-one trillion, two hundred fifty billion, six hundred forty-one million, four hundred thirty-four thousand, four hundred fifty-six".