202201212121021 has 2 divisors, whose sum is σ = 202201212121022. Its totient is φ = 202201212121020.

The previous prime is 202201212120977. The next prime is 202201212121031. The reversal of 202201212121021 is 120121212102202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197519553847225 + 4681658273796 = 14054165^2 + 2163714^2 .

It is a cyclic number.

It is not a de Polignac number, because 202201212121021 - 2²³ = 202201203732413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202201212121021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202201212121031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101100606060510 + 101100606060511.

It is an arithmetic number, because the mean of its divisors is an integer number (101100606060511).

Almost surely, 2^{202201212121021} is an apocalyptic number.

It is an amenable number.

202201212121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202201212121021 is an equidigital number, since it uses as much as digits as its factorization.

202201212121021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 202201212121021 its reverse (120121212102202), we get a palindrome (322322424223223).

The spelling of 202201212121021 in words is "two hundred two trillion, two hundred one billion, two hundred twelve million, one hundred twenty-one thousand, twenty-one".