231333421 has 16 divisors (see below), whose sum is σ = 260333568. Its totient is φ = 203742000.

The previous prime is 231333419. The next prime is 231333461. The reversal of 231333421 is 124333132.

It is not a de Polignac number, because 231333421 - 2¹ = 231333419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231333392 and 231333401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231333461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58146 + ... + 61996.

It is an arithmetic number, because the mean of its divisors is an integer number (16270848).

Almost surely, 2^231333421 is an apocalyptic number.

It is an amenable number.

231333421 is a deficient number, since it is larger than the sum of its proper divisors (29000147).

231333421 is a wasteful number, since it uses less digits than its factorization.

231333421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4032.

The product of its digits is 1296, while the sum is 22.

The square root of 231333421 is about 15209.6489440092. The cubic root of 231333421 is about 613.8743115779.

Adding to 231333421 its reverse (124333132), we get a palindrome (355666553).

The spelling of 231333421 in words is "two hundred thirty-one million, three hundred thirty-three thousand, four hundred twenty-one".