21422516556 has 48 divisors (see below), whose sum is σ = 58063228160. Its totient is φ = 6020377920.

The previous prime is 21422516539. The next prime is 21422516567. The reversal of 21422516556 is 65561522412.

It is a super-2 number, since 2×21422516556² (a number of 21 digits) contains 22 as substring.

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, 2085286 + ... + 2095533.

Almost surely, 2^21422516556 is an apocalyptic number.

It is an amenable number.

21422516556 is an abundant number, since it is smaller than the sum of its proper divisors (36640711604).

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

21422516556 is a wasteful number, since it uses less digits than its factorization.

21422516556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4180894 (or 4180892 counting only the distinct ones).

The product of its digits is 144000, while the sum is 39.

The spelling of 21422516556 in words is "twenty-one billion, four hundred twenty-two million, five hundred sixteen thousand, five hundred fifty-six".