21915148900 has 36 divisors (see below), whose sum is σ = 47567289700. Its totient is φ = 8763955200.

The previous prime is 21915148873. The next prime is 21915148993. The reversal of 21915148900 is 984151912.

It can be written as a sum of positive squares in 6 ways, for example, as 4666529344 + 17248619556 = 68312^2 + 131334^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 432076 + ... + 480124.

Almost surely, 2^21915148900 is an apocalyptic number.

21915148900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21915148900 is an abundant number, since it is smaller than the sum of its proper divisors (25652140800).

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

21915148900 is a wasteful number, since it uses less digits than its factorization.

21915148900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52624 (or 52617 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 40.

The spelling of 21915148900 in words is "twenty-one billion, nine hundred fifteen million, one hundred forty-eight thousand, nine hundred".