421403431 has 2 divisors, whose sum is σ = 421403432. Its totient is φ = 421403430.

The previous prime is 421403417. The next prime is 421403443. The reversal of 421403431 is 134304124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421403431 - 2⁷ = 421403303 is a prime.

It is a super-2 number, since 2×421403431² = 355161703317143522, which contains 22 as substring.

It is equal to p_22415161 and since 421403431 and 22415161 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421403461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210701715 + 210701716.

It is an arithmetic number, because the mean of its divisors is an integer number (210701716).

Almost surely, 2^421403431 is an apocalyptic number.

421403431 is a deficient number, since it is larger than the sum of its proper divisors (1).

421403431 is an equidigital number, since it uses as much as digits as its factorization.

421403431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 421403431 is about 20528.1131865547. The cubic root of 421403431 is about 749.7204475172.

Adding to 421403431 its reverse (134304124), we get a palindrome (555707555).

The spelling of 421403431 in words is "four hundred twenty-one million, four hundred three thousand, four hundred thirty-one".