920122121 has 6 divisors (see below), whose sum is σ = 952945422. Its totient is φ = 888392960.

The previous prime is 920122111. The next prime is 920122141. The reversal of 920122121 is 121221029.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 83466496 + 836655625 = 9136^2 + 28925^2 .

It is a de Polignac number, because none of the positive numbers 2^k-920122121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 920122093 and 920122102.

It is not an unprimeable number, because it can be changed into a prime (920122111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 546200 + ... + 547881.

It is an arithmetic number, because the mean of its divisors is an integer number (158824237).

Almost surely, 2^920122121 is an apocalyptic number.

It is an amenable number.

920122121 is a deficient number, since it is larger than the sum of its proper divisors (32823301).

920122121 is a wasteful number, since it uses less digits than its factorization.

920122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094139 (or 1094110 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 920122121 is about 30333.5148144754. The cubic root of 920122121 is about 972.6318581990.

The spelling of 920122121 in words is "nine hundred twenty million, one hundred twenty-two thousand, one hundred twenty-one".