19921010901 has 16 divisors (see below), whose sum is σ = 29031444480. Its totient is φ = 12050244720.

The previous prime is 19921010897. The next prime is 19921010909. The reversal of 19921010901 is 10901012991.

It is not a de Polignac number, because 19921010901 - 2² = 19921010897 is a prime.

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

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 559861 + ... + 594378.

It is an arithmetic number, because the mean of its divisors is an integer number (1814465280).

Almost surely, 2^19921010901 is an apocalyptic number.

19921010901 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19921010901 is a deficient number, since it is larger than the sum of its proper divisors (9110433579).

19921010901 is a wasteful number, since it uses less digits than its factorization.

19921010901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154776.

The product of its (nonzero) digits is 1458, while the sum is 33.

The spelling of 19921010901 in words is "nineteen billion, nine hundred twenty-one million, ten thousand, nine hundred one".