421957351 has 2 divisors, whose sum is σ = 421957352. Its totient is φ = 421957350.

The previous prime is 421957303. The next prime is 421957387. The reversal of 421957351 is 153759124.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421957351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421957351.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421957451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210978675 + 210978676.

It is an arithmetic number, because the mean of its divisors is an integer number (210978676).

Almost surely, 2^421957351 is an apocalyptic number.

421957351 is a deficient number, since it is larger than the sum of its proper divisors (1).

421957351 is an equidigital number, since it uses as much as digits as its factorization.

421957351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 37.

The square root of 421957351 is about 20541.6004975270. The cubic root of 421957351 is about 750.0487974176.

The spelling of 421957351 in words is "four hundred twenty-one million, nine hundred fifty-seven thousand, three hundred fifty-one".