21625592144 has 80 divisors (see below), whose sum is σ = 46548687360. Its totient is φ = 9670510080.

The previous prime is 21625592137. The next prime is 21625592171. The reversal of 21625592144 is 44129552612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 837377 + ... + 862815.

It is an arithmetic number, because the mean of its divisors is an integer number (581858592).

Almost surely, 2^21625592144 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 21625592144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23274343680).

21625592144 is an abundant number, since it is smaller than the sum of its proper divisors (24923095216).

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

21625592144 is a wasteful number, since it uses less digits than its factorization.

21625592144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25588 (or 25582 counting only the distinct ones).

The product of its digits is 172800, while the sum is 41.

The spelling of 21625592144 in words is "twenty-one billion, six hundred twenty-five million, five hundred ninety-two thousand, one hundred forty-four".