421042399 has 2 divisors, whose sum is σ = 421042400. Its totient is φ = 421042398.

The previous prime is 421042379. The next prime is 421042421. The reversal of 421042399 is 993240124.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421042399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421042339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210521199 + 210521200.

It is an arithmetic number, because the mean of its divisors is an integer number (210521200).

Almost surely, 2^421042399 is an apocalyptic number.

421042399 is a deficient number, since it is larger than the sum of its proper divisors (1).

421042399 is an equidigital number, since it uses as much as digits as its factorization.

421042399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 421042399 is about 20519.3177030816. The cubic root of 421042399 is about 749.5062818760.

It can be divided in two parts, 42 and 1042399, that added together give a square (1042441 = 1021²).

The spelling of 421042399 in words is "four hundred twenty-one million, forty-two thousand, three hundred ninety-nine".