202020012121 has 2 divisors, whose sum is σ = 202020012122. Its totient is φ = 202020012120.

The previous prime is 202020012109. The next prime is 202020012127. The reversal of 202020012121 is 121210020202.

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., 165026875225 + 36993136896 = 406235^2 + 192336^2 .

It is a cyclic number.

It is not a de Polignac number, because 202020012121 - 2⁷ = 202020011993 is a prime.

It is not a weakly prime, because it can be changed into another prime (202020012127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101010006060 + 101010006061.

It is an arithmetic number, because the mean of its divisors is an integer number (101010006061).

Almost surely, 2^202020012121 is an apocalyptic number.

It is an amenable number.

202020012121 is a deficient number, since it is larger than the sum of its proper divisors (1).

202020012121 is an equidigital number, since it uses as much as digits as its factorization.

202020012121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 202020012121 its reverse (121210020202), we get a palindrome (323230032323).

The spelling of 202020012121 in words is "two hundred two billion, twenty million, twelve thousand, one hundred twenty-one".