21202022090 has 96 divisors (see below), whose sum is σ = 42882591024. Its totient is φ = 7516651520.

The previous prime is 21202022071. The next prime is 21202022117. The reversal of 21202022090 is 9022020212.

It can be written as a sum of positive squares in 24 ways, for example, as 5572771801 + 15629250289 = 74651^2 + 125017^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5859962 + ... + 5863578.

Almost surely, 2^21202022090 is an apocalyptic number.

21202022090 is an abundant number, since it is smaller than the sum of its proper divisors (21680568934).

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

21202022090 is a wasteful number, since it uses less digits than its factorization.

21202022090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3740 (or 3711 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The spelling of 21202022090 in words is "twenty-one billion, two hundred two million, twenty-two thousand, ninety".