202120313221 has 2 divisors, whose sum is σ = 202120313222. Its totient is φ = 202120313220.

The previous prime is 202120313207. The next prime is 202120313233. The reversal of 202120313221 is 122313021202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171209750625 + 30910562596 = 413775^2 + 175814^2 .

It is a cyclic number.

It is not a de Polignac number, because 202120313221 - 2²⁹ = 201583442309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202120313821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060156610 + 101060156611.

It is an arithmetic number, because the mean of its divisors is an integer number (101060156611).

Almost surely, 2^202120313221 is an apocalyptic number.

It is an amenable number.

202120313221 is a deficient number, since it is larger than the sum of its proper divisors (1).

202120313221 is an equidigital number, since it uses as much as digits as its factorization.

202120313221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 202120313221 its reverse (122313021202), we get a palindrome (324433334423).

The spelling of 202120313221 in words is "two hundred two billion, one hundred twenty million, three hundred thirteen thousand, two hundred twenty-one".