202132421 has 2 divisors, whose sum is σ = 202132422. Its totient is φ = 202132420.

The previous prime is 202132409. The next prime is 202132423. The reversal of 202132421 is 124231202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185232100 + 16900321 = 13610^2 + 4111^2 .

It is a cyclic number.

It is not a de Polignac number, because 202132421 - 2¹⁴ = 202116037 is a prime.

Together with 202132423, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202132421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202132423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101066210 + 101066211.

It is an arithmetic number, because the mean of its divisors is an integer number (101066211).

Almost surely, 2^202132421 is an apocalyptic number.

It is an amenable number.

202132421 is a deficient number, since it is larger than the sum of its proper divisors (1).

202132421 is an equidigital number, since it uses as much as digits as its factorization.

202132421 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 17.

The square root of 202132421 is about 14217.3281948473. The cubic root of 202132421 is about 586.8746166151.

Adding to 202132421 its reverse (124231202), we get a palindrome (326363623).

The spelling of 202132421 in words is "two hundred two million, one hundred thirty-two thousand, four hundred twenty-one".