19301921091 has 48 divisors (see below), whose sum is σ = 30412987488. Its totient is φ = 11746944000.

The previous prime is 19301921087. The next prime is 19301921099. The reversal of 19301921091 is 19012910391.

It is not a de Polignac number, because 19301921091 - 2² = 19301921087 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (19301921099) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1868641 + ... + 1878941.

It is an arithmetic number, because the mean of its divisors is an integer number (633603906).

Almost surely, 2^19301921091 is an apocalyptic number.

19301921091 is a deficient number, since it is larger than the sum of its proper divisors (11111066397).

19301921091 is a wasteful number, since it uses less digits than its factorization.

19301921091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10692 (or 10689 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 36.

The spelling of 19301921091 in words is "nineteen billion, three hundred one million, nine hundred twenty-one thousand, ninety-one".