421431231 has 16 divisors (see below), whose sum is σ = 631443456. Its totient is φ = 248066016.

The previous prime is 421431223. The next prime is 421431239. The reversal of 421431231 is 132134124.

It is an interprime number because it is at equal distance from previous prime (421431223) and next prime (421431239).

It is not a de Polignac number, because 421431231 - 2³ = 421431223 is a prime.

It is a super-2 number, since 2×421431231² = 355208564924350722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 421431198 and 421431207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421431239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234015 + ... + 235808.

It is an arithmetic number, because the mean of its divisors is an integer number (39465216).

Almost surely, 2^421431231 is an apocalyptic number.

421431231 is a deficient number, since it is larger than the sum of its proper divisors (210012225).

421431231 is a wasteful number, since it uses less digits than its factorization.

421431231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469862.

The product of its digits is 576, while the sum is 21.

The square root of 421431231 is about 20528.7902955824. The cubic root of 421431231 is about 749.7369335166.

Adding to 421431231 its reverse (132134124), we get a palindrome (553565355).

The spelling of 421431231 in words is "four hundred twenty-one million, four hundred thirty-one thousand, two hundred thirty-one".