1920117800921 has 12 divisors (see below), whose sum is σ = 1966297949616. Its totient is φ = 1874008153920.

The previous prime is 1920117800917. The next prime is 1920117800957. The reversal of 1920117800921 is 1290087110291.

It is not a de Polignac number, because 1920117800921 - 2² = 1920117800917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1920117200921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79637750 + ... + 79661856.

It is an arithmetic number, because the mean of its divisors is an integer number (163858162468).

Almost surely, 2^{1920117800921} is an apocalyptic number.

It is an amenable number.

1920117800921 is a deficient number, since it is larger than the sum of its proper divisors (46180148695).

1920117800921 is an frugal number, since it uses more digits than its factorization.

1920117800921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26872 (or 25511 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 41.

The spelling of 1920117800921 in words is "one trillion, nine hundred twenty billion, one hundred seventeen million, eight hundred thousand, nine hundred twenty-one".