19921010900 has 72 divisors (see below), whose sum is σ = 50739419136. Its totient is φ = 6645456000.

The previous prime is 19921010897. The next prime is 19921010909. The reversal of 19921010900 is 901012991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19921010909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 358676 + ... + 410475.

Almost surely, 2^19921010900 is an apocalyptic number.

19921010900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19921010900 is an abundant number, since it is smaller than the sum of its proper divisors (30818408236).

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

19921010900 is a wasteful number, since it uses less digits than its factorization.

19921010900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769209 (or 769202 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 32.

The spelling of 19921010900 in words is "nineteen billion, nine hundred twenty-one million, ten thousand, nine hundred".