421131231 has 20 divisors (see below), whose sum is σ = 630156384. Its totient is φ = 280281600.

The previous prime is 421131209. The next prime is 421131253. The reversal of 421131231 is 132131124.

421131231 is a `hidden beast` number, since 421 + 13 + 1 + 231 = 666.

It is an interprime number because it is at equal distance from previous prime (421131209) and next prime (421131253).

It is not a de Polignac number, because 421131231 - 2⁶ = 421131167 is a prime.

It is a super-2 number, since 2×421131231² = 354703027447150722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421131031) 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 in 19 ways as a sum of consecutive naturals, for example, 47866 + ... + 55976.

Almost surely, 2^421131231 is an apocalyptic number.

421131231 is a deficient number, since it is larger than the sum of its proper divisors (209025153).

421131231 is an equidigital number, since it uses as much as digits as its factorization.

421131231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8764 (or 8755 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 421131231 is about 20521.4821833122. The cubic root of 421131231 is about 749.5589887296.

Adding to 421131231 its reverse (132131124), we get a palindrome (553262355).

The spelling of 421131231 in words is "four hundred twenty-one million, one hundred thirty-one thousand, two hundred thirty-one".