202101022121 has 2 divisors, whose sum is σ = 202101022122. Its totient is φ = 202101022120.

The previous prime is 202101022117. The next prime is 202101022139. The reversal of 202101022121 is 121220101202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122104819225 + 79996202896 = 349435^2 + 282836^2 .

It is a cyclic number.

It is not a de Polignac number, because 202101022121 - 2² = 202101022117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 202101022096 and 202101022105.

It is not a weakly prime, because it can be changed into another prime (202101022111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101050511060 + 101050511061.

It is an arithmetic number, because the mean of its divisors is an integer number (101050511061).

Almost surely, 2^202101022121 is an apocalyptic number.

It is an amenable number.

202101022121 is a deficient number, since it is larger than the sum of its proper divisors (1).

202101022121 is an equidigital number, since it uses as much as digits as its factorization.

202101022121 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 14.

Adding to 202101022121 its reverse (121220101202), we get a palindrome (323321123323).

The spelling of 202101022121 in words is "two hundred two billion, one hundred one million, twenty-two thousand, one hundred twenty-one".