202111001222021 has 2 divisors, whose sum is σ = 202111001222022. Its totient is φ = 202111001222020.

The previous prime is 202111001221931. The next prime is 202111001222023. The reversal of 202111001222021 is 120222100111202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167251884108100 + 34859117113921 = 12932590^2 + 5904161^2 .

It is a cyclic number.

It is not a de Polignac number, because 202111001222021 - 2³⁴ = 202093821352837 is a prime.

Together with 202111001222023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202111001222023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101055500611010 + 101055500611011.

It is an arithmetic number, because the mean of its divisors is an integer number (101055500611011).

Almost surely, 2^{202111001222021} is an apocalyptic number.

It is an amenable number.

202111001222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202111001222021 is an equidigital number, since it uses as much as digits as its factorization.

202111001222021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 202111001222021 its reverse (120222100111202), we get a palindrome (322333101333223).

The spelling of 202111001222021 in words is "two hundred two trillion, one hundred eleven billion, one million, two hundred twenty-two thousand, twenty-one".