21855263152 has 20 divisors (see below), whose sum is σ = 44573234680. Its totient is φ = 10352492928.

The previous prime is 21855263123. The next prime is 21855263167. The reversal of 21855263152 is 25136255812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35945853 + ... + 35946460.

It is an arithmetic number, because the mean of its divisors is an integer number (2228661734).

Almost surely, 2^21855263152 is an apocalyptic number.

It is an amenable number.

21855263152 is an abundant number, since it is smaller than the sum of its proper divisors (22717971528).

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

21855263152 is a wasteful number, since it uses less digits than its factorization.

21855263152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71892340 (or 71892334 counting only the distinct ones).

The product of its digits is 144000, while the sum is 40.

The spelling of 21855263152 in words is "twenty-one billion, eight hundred fifty-five million, two hundred sixty-three thousand, one hundred fifty-two".