21852577472 has 112 divisors (see below), whose sum is σ = 49827923712. Its totient is φ = 9411578880.

The previous prime is 21852577469. The next prime is 21852577493. The reversal of 21852577472 is 27477525812.

It is a self number, because there is not a number n which added to its sum of digits gives 21852577472.

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, 1726238 + ... + 1738850.

It is an arithmetic number, because the mean of its divisors is an integer number (444892176).

Almost surely, 2^21852577472 is an apocalyptic number.

21852577472 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21852577472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24913961856).

21852577472 is an abundant number, since it is smaller than the sum of its proper divisors (27975346240).

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

21852577472 is a wasteful number, since it uses less digits than its factorization.

21852577472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12766 (or 12756 counting only the distinct ones).

The product of its digits is 2195200, while the sum is 50.

The spelling of 21852577472 in words is "twenty-one billion, eight hundred fifty-two million, five hundred seventy-seven thousand, four hundred seventy-two".