421903291 has 2 divisors, whose sum is σ = 421903292. Its totient is φ = 421903290.

The previous prime is 421903171. The next prime is 421903309. The reversal of 421903291 is 192309124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421903291 - 2¹⁵ = 421870523 is a prime.

It is not a weakly prime, because it can be changed into another prime (421303291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210951645 + 210951646.

It is an arithmetic number, because the mean of its divisors is an integer number (210951646).

Almost surely, 2^421903291 is an apocalyptic number.

421903291 is a deficient number, since it is larger than the sum of its proper divisors (1).

421903291 is an equidigital number, since it uses as much as digits as its factorization.

421903291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 421903291 is about 20540.2845890703. The cubic root of 421903291 is about 750.0167646623.

The spelling of 421903291 in words is "four hundred twenty-one million, nine hundred three thousand, two hundred ninety-one".