202202121020021 has 2 divisors, whose sum is σ = 202202121020022. Its totient is φ = 202202121020020.

The previous prime is 202202121020017. The next prime is 202202121020063. The reversal of 202202121020021 is 120020121202202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121218140227921 + 80983980792100 = 11009911^2 + 8999110^2 .

It is a cyclic number.

It is not a de Polignac number, because 202202121020021 - 2² = 202202121020017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202202121020071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101101060510010 + 101101060510011.

It is an arithmetic number, because the mean of its divisors is an integer number (101101060510011).

Almost surely, 2^{202202121020021} is an apocalyptic number.

It is an amenable number.

202202121020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202202121020021 is an equidigital number, since it uses as much as digits as its factorization.

202202121020021 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 17.

Adding to 202202121020021 its reverse (120020121202202), we get a palindrome (322222242222223).

The spelling of 202202121020021 in words is "two hundred two trillion, two hundred two billion, one hundred twenty-one million, twenty thousand, twenty-one".