202320421 has 2 divisors, whose sum is σ = 202320422. Its totient is φ = 202320420.

The previous prime is 202320413. The next prime is 202320457. The reversal of 202320421 is 124023202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121859521 + 80460900 = 11039^2 + 8970^2 .

It is a cyclic number.

It is not a de Polignac number, because 202320421 - 2³ = 202320413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202320395 and 202320404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202320401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101160210 + 101160211.

It is an arithmetic number, because the mean of its divisors is an integer number (101160211).

Almost surely, 2^202320421 is an apocalyptic number.

It is an amenable number.

202320421 is a deficient number, since it is larger than the sum of its proper divisors (1).

202320421 is an equidigital number, since it uses as much as digits as its factorization.

202320421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 202320421 is about 14223.9383083589. The cubic root of 202320421 is about 587.0565076726.

Adding to 202320421 its reverse (124023202), we get a palindrome (326343623).

The spelling of 202320421 in words is "two hundred two million, three hundred twenty thousand, four hundred twenty-one".