421425139 has 2 divisors, whose sum is σ = 421425140. Its totient is φ = 421425138.

The previous prime is 421425127. The next prime is 421425143. The reversal of 421425139 is 931524124.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421425139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421425139.

It is not a weakly prime, because it can be changed into another prime (421425119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210712569 + 210712570.

It is an arithmetic number, because the mean of its divisors is an integer number (210712570).

Almost surely, 2^421425139 is an apocalyptic number.

421425139 is a deficient number, since it is larger than the sum of its proper divisors (1).

421425139 is an equidigital number, since it uses as much as digits as its factorization.

421425139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 421425139 is about 20528.6419180617. The cubic root of 421425139 is about 749.7333208913.

The spelling of 421425139 in words is "four hundred twenty-one million, four hundred twenty-five thousand, one hundred thirty-nine".