21377884208 has 80 divisors (see below), whose sum is σ = 43345725696. Its totient is φ = 10202357760.

The previous prime is 21377884193. The next prime is 21377884273. The reversal of 21377884208 is 80248877312.

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, 13058366 + ... + 13060002.

Almost surely, 2^21377884208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21377884208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21672862848).

21377884208 is an abundant number, since it is smaller than the sum of its proper divisors (21967841488).

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

21377884208 is a wasteful number, since it uses less digits than its factorization.

21377884208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022 (or 2016 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 50.

The spelling of 21377884208 in words is "twenty-one billion, three hundred seventy-seven million, eight hundred eighty-four thousand, two hundred eight".