21562884138 has 16 divisors (see below), whose sum is σ = 43128409536. Its totient is φ = 7187187840.

The previous prime is 21562884121. The next prime is 21562884181. The reversal of 21562884138 is 83148826512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5395 + ... + 207737.

It is an arithmetic number, because the mean of its divisors is an integer number (2695525596).

Almost surely, 2^21562884138 is an apocalyptic number.

21562884138 is an abundant number, since it is smaller than the sum of its proper divisors (21565525398).

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

21562884138 is a wasteful number, since it uses less digits than its factorization.

21562884138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220109.

The product of its digits is 737280, while the sum is 48.

The spelling of 21562884138 in words is "twenty-one billion, five hundred sixty-two million, eight hundred eighty-four thousand, one hundred thirty-eight".