21151293900 has 72 divisors (see below), whose sum is σ = 66761185344. Its totient is φ = 5127585600.

The previous prime is 21151293899. The next prime is 21151293931. The reversal of 21151293900 is 939215112.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3201442 + ... + 3208041.

Almost surely, 2^21151293900 is an apocalyptic number.

21151293900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21151293900 is an abundant number, since it is smaller than the sum of its proper divisors (45609891444).

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

21151293900 is a wasteful number, since it uses less digits than its factorization.

21151293900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6409511 (or 6409504 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 33.

The spelling of 21151293900 in words is "twenty-one billion, one hundred fifty-one million, two hundred ninety-three thousand, nine hundred".