21870581136 has 80 divisors (see below), whose sum is σ = 58982546304. Its totient is φ = 6970028032.

The previous prime is 21870581099. The next prime is 21870581143. The reversal of 21870581136 is 63118507812.

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, 3990430 + ... + 3995906.

Almost surely, 2^21870581136 is an apocalyptic number.

It is an amenable number.

21870581136 is an abundant number, since it is smaller than the sum of its proper divisors (37111965168).

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

21870581136 is a wasteful number, since it uses less digits than its factorization.

21870581136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9128 (or 9122 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The spelling of 21870581136 in words is "twenty-one billion, eight hundred seventy million, five hundred eighty-one thousand, one hundred thirty-six".