21022888620 has 48 divisors (see below), whose sum is σ = 58926405888. Its totient is φ = 5600168640.

The previous prime is 21022888609. The next prime is 21022888643. The reversal of 21022888620 is 2688822012.

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, 128176 + ... + 241815.

It is an arithmetic number, because the mean of its divisors is an integer number (1227633456).

Almost surely, 2^21022888620 is an apocalyptic number.

21022888620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022888620 is an abundant number, since it is smaller than the sum of its proper divisors (37903517268).

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

21022888620 is a wasteful number, since it uses less digits than its factorization.

21022888620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370950 (or 370948 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 39.

The spelling of 21022888620 in words is "twenty-one billion, twenty-two million, eight hundred eighty-eight thousand, six hundred twenty".