20192921091 has 24 divisors (see below), whose sum is σ = 33364846944. Its totient is φ = 11528254080.

The previous prime is 20192921087. The next prime is 20192921101. The reversal of 20192921091 is 19012929102.

It is not a de Polignac number, because 20192921091 - 2² = 20192921087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20192921191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76980 + ... + 215201.

It is an arithmetic number, because the mean of its divisors is an integer number (1390201956).

Almost surely, 2^20192921091 is an apocalyptic number.

20192921091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20192921091 is a deficient number, since it is larger than the sum of its proper divisors (13171925853).

20192921091 is a wasteful number, since it uses less digits than its factorization.

20192921091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293291 (or 293288 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The spelling of 20192921091 in words is "twenty billion, one hundred ninety-two million, nine hundred twenty-one thousand, ninety-one".