21655262224 has 20 divisors (see below), whose sum is σ = 41959363536. Its totient is φ = 10827039392.

The previous prime is 21655262219. The next prime is 21655262227. The reversal of 21655262224 is 42226255612.

It is not an unprimeable number, because it can be changed into a prime (21655262227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 510867 + ... + 551629.

Almost surely, 2^21655262224 is an apocalyptic number.

It is an amenable number.

21655262224 is a deficient number, since it is larger than the sum of its proper divisors (20304101312).

21655262224 is a wasteful number, since it uses less digits than its factorization.

21655262224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73974 (or 73968 counting only the distinct ones).

The product of its digits is 115200, while the sum is 37.

The spelling of 21655262224 in words is "twenty-one billion, six hundred fifty-five million, two hundred sixty-two thousand, two hundred twenty-four".