21530902422 has 32 divisors (see below), whose sum is σ = 43323920640. Its totient is φ = 7133326560.

The previous prime is 21530902381. The next prime is 21530902453. The reversal of 21530902422 is 22420903512.

It is a self number, because there is not a number n which added to its sum of digits gives 21530902422.

It is a congruent number.

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, 2431479 + ... + 2440317.

It is an arithmetic number, because the mean of its divisors is an integer number (1353872520).

Almost surely, 2^21530902422 is an apocalyptic number.

21530902422 is an abundant number, since it is smaller than the sum of its proper divisors (21793018218).

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

21530902422 is a wasteful number, since it uses less digits than its factorization.

21530902422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11268.

The product of its (nonzero) digits is 8640, while the sum is 30.

It can be divided in two parts, 2153090 and 2422, that added together give a palindrome (2155512).

The spelling of 21530902422 in words is "twenty-one billion, five hundred thirty million, nine hundred two thousand, four hundred twenty-two".