9920200121 has 6 divisors (see below), whose sum is σ = 10741992030. Its totient is φ = 9157107648.

The previous prime is 9920200109. The next prime is 9920200123. The reversal of 9920200121 is 1210020299.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 194295721 + 9725904400 = 13939^2 + 98620^2 .

It is a de Polignac number, because none of the positive numbers 2^k-9920200121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9920200123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29349536 + ... + 29349873.

It is an arithmetic number, because the mean of its divisors is an integer number (1790332005).

Almost surely, 2^9920200121 is an apocalyptic number.

It is an amenable number.

9920200121 is a deficient number, since it is larger than the sum of its proper divisors (821791909).

9920200121 is a wasteful number, since it uses less digits than its factorization.

9920200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58699435 (or 58699422 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 9920200121 is about 99600.2014104389. The cubic root of 9920200121 is about 2148.6885906314.

The spelling of 9920200121 in words is "nine billion, nine hundred twenty million, two hundred thousand, one hundred twenty-one".