21837225544 has 16 divisors (see below), whose sum is σ = 41616025020. Its totient is φ = 10739618880.

The previous prime is 21837225539. The next prime is 21837225607. The reversal of 21837225544 is 44552273812.

It can be written as a sum of positive squares in 2 ways, for example, as 15261637444 + 6575588100 = 123538^2 + 81090^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21837225544.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22373719 + ... + 22374694.

Almost surely, 2^21837225544 is an apocalyptic number.

It is an amenable number.

21837225544 is a deficient number, since it is larger than the sum of its proper divisors (19778799476).

21837225544 is a wasteful number, since it uses less digits than its factorization.

21837225544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44748480 (or 44748476 counting only the distinct ones).

The product of its digits is 537600, while the sum is 43.

The spelling of 21837225544 in words is "twenty-one billion, eight hundred thirty-seven million, two hundred twenty-five thousand, five hundred forty-four".