202111021111121 has 2 divisors, whose sum is σ = 202111021111122. Its totient is φ = 202111021111120.

The previous prime is 202111021111061. The next prime is 202111021111133. The reversal of 202111021111121 is 121111120111202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125899867101121 + 76211154010000 = 11220511^2 + 8729900^2 .

It is a cyclic number.

It is not a de Polignac number, because 202111021111121 - 2²² = 202111016916817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202111021111121.

It is not a weakly prime, because it can be changed into another prime (202111021131121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101055510555560 + 101055510555561.

It is an arithmetic number, because the mean of its divisors is an integer number (101055510555561).

Almost surely, 2^{202111021111121} is an apocalyptic number.

It is an amenable number.

202111021111121 is a deficient number, since it is larger than the sum of its proper divisors (1).

202111021111121 is an equidigital number, since it uses as much as digits as its factorization.

202111021111121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 202111021111121 its reverse (121111120111202), we get a palindrome (323222141222323).

The spelling of 202111021111121 in words is "two hundred two trillion, one hundred eleven billion, twenty-one million, one hundred eleven thousand, one hundred twenty-one".