21093921100 has 72 divisors (see below), whose sum is σ = 52335261440. Its totient is φ = 7229113920.

The previous prime is 21093921097. The next prime is 21093921119. The reversal of 21093921100 is 112939012.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2150407 + ... + 2160193.

Almost surely, 2^21093921100 is an apocalyptic number.

21093921100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21093921100 is an abundant number, since it is smaller than the sum of its proper divisors (31241340340).

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

21093921100 is a wasteful number, since it uses less digits than its factorization.

21093921100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12887 (or 12880 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 28.

The spelling of 21093921100 in words is "twenty-one billion, ninety-three million, nine hundred twenty-one thousand, one hundred".