21197613900 has 36 divisors (see below), whose sum is σ = 61331763752. Its totient is φ = 5652696960.

The previous prime is 21197613889. The next prime is 21197613917. The reversal of 21197613900 is 931679112.

It is a happy number.

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, 35329057 + ... + 35329656.

Almost surely, 2^21197613900 is an apocalyptic number.

21197613900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21197613900 is an abundant number, since it is smaller than the sum of its proper divisors (40134149852).

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

21197613900 is a wasteful number, since it uses less digits than its factorization.

21197613900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70658730 (or 70658723 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 39.

The spelling of 21197613900 in words is "twenty-one billion, one hundred ninety-seven million, six hundred thirteen thousand, nine hundred".