421250521 has 2 divisors, whose sum is σ = 421250522. Its totient is φ = 421250520.

The previous prime is 421250471. The next prime is 421250527. The reversal of 421250521 is 125052124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 343175625 + 78074896 = 18525^2 + 8836^2 .

It is a cyclic number.

It is not a de Polignac number, because 421250521 - 2⁷ = 421250393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421250492 and 421250501.

It is not a weakly prime, because it can be changed into another prime (421250527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210625260 + 210625261.

It is an arithmetic number, because the mean of its divisors is an integer number (210625261).

Almost surely, 2^421250521 is an apocalyptic number.

It is an amenable number.

421250521 is a deficient number, since it is larger than the sum of its proper divisors (1).

421250521 is an equidigital number, since it uses as much as digits as its factorization.

421250521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 421250521 is about 20524.3884439951. The cubic root of 421250521 is about 749.6297556259.

The spelling of 421250521 in words is "four hundred twenty-one million, two hundred fifty thousand, five hundred twenty-one".