202001311101221 has 2 divisors, whose sum is σ = 202001311101222. Its totient is φ = 202001311101220.

The previous prime is 202001311101169. The next prime is 202001311101223. The reversal of 202001311101221 is 122101113100202.

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., 197123004002500 + 4878307098721 = 14040050^2 + 2208689^2 .

It is a cyclic number.

It is not a de Polignac number, because 202001311101221 - 2¹⁸ = 202001310839077 is a prime.

It is a super-2 number, since 2×202001311101221² (a number of 29 digits) contains 22 as substring.

Together with 202001311101223, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202001311101221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202001311101223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101000655550610 + 101000655550611.

It is an arithmetic number, because the mean of its divisors is an integer number (101000655550611).

Almost surely, 2^{202001311101221} is an apocalyptic number.

It is an amenable number.

202001311101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

202001311101221 is an equidigital number, since it uses as much as digits as its factorization.

202001311101221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 202001311101221 its reverse (122101113100202), we get a palindrome (324102424201423).

The spelling of 202001311101221 in words is "two hundred two trillion, one billion, three hundred eleven million, one hundred one thousand, two hundred twenty-one".