202257421 has 2 divisors, whose sum is σ = 202257422. Its totient is φ = 202257420.

The previous prime is 202257401. The next prime is 202257437. The reversal of 202257421 is 124752202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181872196 + 20385225 = 13486^2 + 4515^2 .

It is a cyclic number.

It is not a de Polignac number, because 202257421 - 2¹⁵ = 202224653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202257401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101128710 + 101128711.

It is an arithmetic number, because the mean of its divisors is an integer number (101128711).

Almost surely, 2^202257421 is an apocalyptic number.

It is an amenable number.

202257421 is a deficient number, since it is larger than the sum of its proper divisors (1).

202257421 is an equidigital number, since it uses as much as digits as its factorization.

202257421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 202257421 is about 14221.7235594002. The cubic root of 202257421 is about 586.9955673759.

The spelling of 202257421 in words is "two hundred two million, two hundred fifty-seven thousand, four hundred twenty-one".