21652237056 has 216 divisors, whose sum is σ = 62939706480. Its totient is φ = 6599319552.

The previous prime is 21652237043. The next prime is 21652237069. The reversal of 21652237056 is 65073225612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21652237043) and next prime (21652237069).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8038846 + ... + 8041538.

It is an arithmetic number, because the mean of its divisors is an integer number (291387530).

Almost surely, 2^21652237056 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 21652237056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31469853240).

21652237056 is an abundant number, since it is smaller than the sum of its proper divisors (41287469424).

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

21652237056 is a wasteful number, since it uses less digits than its factorization.

21652237056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2779 (or 2746 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 39.

The spelling of 21652237056 in words is "twenty-one billion, six hundred fifty-two million, two hundred thirty-seven thousand, fifty-six".