202121212313 has 2 divisors, whose sum is σ = 202121212314. Its totient is φ = 202121212312.

The previous prime is 202121212303. The next prime is 202121212327. The reversal of 202121212313 is 313212121202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119641967449 + 82479244864 = 345893^2 + 287192^2 .

It is a cyclic number.

It is not a de Polignac number, because 202121212313 - 2⁴ = 202121212297 is a prime.

It is not a weakly prime, because it can be changed into another prime (202121212303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060606156 + 101060606157.

It is an arithmetic number, because the mean of its divisors is an integer number (101060606157).

Almost surely, 2^202121212313 is an apocalyptic number.

It is an amenable number.

202121212313 is a deficient number, since it is larger than the sum of its proper divisors (1).

202121212313 is an equidigital number, since it uses as much as digits as its factorization.

202121212313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 202121212313 its reverse (313212121202), we get a palindrome (515333333515).

The spelling of 202121212313 in words is "two hundred two billion, one hundred twenty-one million, two hundred twelve thousand, three hundred thirteen".