202120120109 has 2 divisors, whose sum is σ = 202120120110. Its totient is φ = 202120120108.

The previous prime is 202120119983. The next prime is 202120120177. The reversal of 202120120109 is 901021021202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132188962084 + 69931158025 = 363578^2 + 264445^2 .

It is a cyclic number.

It is not a de Polignac number, because 202120120109 - 2⁸ = 202120119853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202120128109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060060054 + 101060060055.

It is an arithmetic number, because the mean of its divisors is an integer number (101060060055).

Almost surely, 2^202120120109 is an apocalyptic number.

It is an amenable number.

202120120109 is a deficient number, since it is larger than the sum of its proper divisors (1).

202120120109 is an equidigital number, since it uses as much as digits as its factorization.

202120120109 is an evil number, because the sum of its binary digits is even.

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

The spelling of 202120120109 in words is "two hundred two billion, one hundred twenty million, one hundred twenty thousand, one hundred nine".