202313120021 has 2 divisors, whose sum is σ = 202313120022. Its totient is φ = 202313120020.

The previous prime is 202313120003. The next prime is 202313120029. The reversal of 202313120021 is 120021313202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147844095025 + 54469024996 = 384505^2 + 233386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202313120021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202313120029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101156560010 + 101156560011.

It is an arithmetic number, because the mean of its divisors is an integer number (101156560011).

Almost surely, 2^202313120021 is an apocalyptic number.

It is an amenable number.

202313120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202313120021 is an equidigital number, since it uses as much as digits as its factorization.

202313120021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 202313120021 its reverse (120021313202), we get a palindrome (322334433223).

The spelling of 202313120021 in words is "two hundred two billion, three hundred thirteen million, one hundred twenty thousand, twenty-one".