21900992100 has 72 divisors (see below), whose sum is σ = 68241257280. Its totient is φ = 5391012480.

The previous prime is 21900992089. The next prime is 21900992111. The reversal of 21900992100 is 129900912.

It is an interprime number because it is at equal distance from previous prime (21900992089) and next prime (21900992111).

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, 2803920 + ... + 2811719.

It is an arithmetic number, because the mean of its divisors is an integer number (947795240).

Almost surely, 2^21900992100 is an apocalyptic number.

21900992100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21900992100 is an abundant number, since it is smaller than the sum of its proper divisors (46340265180).

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

21900992100 is a wasteful number, since it uses less digits than its factorization.

21900992100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5615669 (or 5615662 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 33.

The spelling of 21900992100 in words is "twenty-one billion, nine hundred million, nine hundred ninety-two thousand, one hundred".