202120240343221 has 2 divisors, whose sum is σ = 202120240343222. Its totient is φ = 202120240343220.

The previous prime is 202120240343207. The next prime is 202120240343269. The reversal of 202120240343221 is 122343042021202.

202120240343221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201495327959025 + 624912384196 = 14194905^2 + 790514^2 .

It is a cyclic number.

It is not a de Polignac number, because 202120240343221 - 2²⁵ = 202120206788789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202120240343221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202120240343921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060120171610 + 101060120171611.

It is an arithmetic number, because the mean of its divisors is an integer number (101060120171611).

Almost surely, 2^{202120240343221} is an apocalyptic number.

It is an amenable number.

202120240343221 is a deficient number, since it is larger than the sum of its proper divisors (1).

202120240343221 is an equidigital number, since it uses as much as digits as its factorization.

202120240343221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 202120240343221 its reverse (122343042021202), we get a palindrome (324463282364423).

The spelling of 202120240343221 in words is "two hundred two trillion, one hundred twenty billion, two hundred forty million, three hundred forty-three thousand, two hundred twenty-one".