202121211111121 has 2 divisors, whose sum is σ = 202121211111122. Its totient is φ = 202121211111120.

The previous prime is 202121211111119. The next prime is 202121211111161. The reversal of 202121211111121 is 121111112121202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135819911472400 + 66301299638721 = 11654180^2 + 8142561^2 .

It is a cyclic number.

It is not a de Polignac number, because 202121211111121 - 2¹ = 202121211111119 is a prime.

Together with 202121211111119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (202121211111161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060605555560 + 101060605555561.

It is an arithmetic number, because the mean of its divisors is an integer number (101060605555561).

Almost surely, 2^{202121211111121} is an apocalyptic number.

It is an amenable number.

202121211111121 is a deficient number, since it is larger than the sum of its proper divisors (1).

202121211111121 is an equidigital number, since it uses as much as digits as its factorization.

202121211111121 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 19.

Adding to 202121211111121 its reverse (121111112121202), we get a palindrome (323232323232323).

The spelling of 202121211111121 in words is "two hundred two trillion, one hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, one hundred twenty-one".