421407331 has 2 divisors, whose sum is σ = 421407332. Its totient is φ = 421407330.

The previous prime is 421407281. The next prime is 421407341. The reversal of 421407331 is 133704124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421407331 - 2⁹ = 421406819 is a prime.

It is a super-2 number, since 2×421407331² = 355168277241087122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 421407296 and 421407305.

It is not a weakly prime, because it can be changed into another prime (421407341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210703665 + 210703666.

It is an arithmetic number, because the mean of its divisors is an integer number (210703666).

Almost surely, 2^421407331 is an apocalyptic number.

421407331 is a deficient number, since it is larger than the sum of its proper divisors (1).

421407331 is an equidigital number, since it uses as much as digits as its factorization.

421407331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 421407331 is about 20528.2081780169. The cubic root of 421407331 is about 749.7227603450.

The spelling of 421407331 in words is "four hundred twenty-one million, four hundred seven thousand, three hundred thirty-one".