201002022121 has 2 divisors, whose sum is σ = 201002022122. Its totient is φ = 201002022120.

The previous prime is 201002022083. The next prime is 201002022139. The reversal of 201002022121 is 121220200102.

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., 193194532521 + 7807489600 = 439539^2 + 88360^2 .

It is a cyclic number.

It is not a de Polignac number, because 201002022121 - 2²⁷ = 200867804393 is a prime.

It is not a weakly prime, because it can be changed into another prime (201002022191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100501011060 + 100501011061.

It is an arithmetic number, because the mean of its divisors is an integer number (100501011061).

Almost surely, 2^201002022121 is an apocalyptic number.

It is an amenable number.

201002022121 is a deficient number, since it is larger than the sum of its proper divisors (1).

201002022121 is an equidigital number, since it uses as much as digits as its factorization.

201002022121 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 201002022121 its reverse (121220200102), we get a palindrome (322222222223).

The spelling of 201002022121 in words is "two hundred one billion, two million, twenty-two thousand, one hundred twenty-one".