421157423 has 2 divisors, whose sum is σ = 421157424. Its totient is φ = 421157422.

The previous prime is 421157389. The next prime is 421157479. The reversal of 421157423 is 324751124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421157423 - 2²⁰ = 420108847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421157323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210578711 + 210578712.

It is an arithmetic number, because the mean of its divisors is an integer number (210578712).

Almost surely, 2^421157423 is an apocalyptic number.

421157423 is a deficient number, since it is larger than the sum of its proper divisors (1).

421157423 is an equidigital number, since it uses as much as digits as its factorization.

421157423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 29.

The square root of 421157423 is about 20522.1203339226. The cubic root of 421157423 is about 749.5745278621.

The spelling of 421157423 in words is "four hundred twenty-one million, one hundred fifty-seven thousand, four hundred twenty-three".