231133421 has 4 divisors (see below), whose sum is σ = 231217344. Its totient is φ = 231049500.

The previous prime is 231133391. The next prime is 231133429. The reversal of 231133421 is 124331132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231133421 - 2²⁶ = 164024557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231133393 and 231133402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231133429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37685 + ... + 43386.

It is an arithmetic number, because the mean of its divisors is an integer number (57804336).

Almost surely, 2^231133421 is an apocalyptic number.

It is an amenable number.

231133421 is a deficient number, since it is larger than the sum of its proper divisors (83923).

231133421 is an equidigital number, since it uses as much as digits as its factorization.

231133421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83922.

The product of its digits is 432, while the sum is 20.

The square root of 231133421 is about 15203.0727486255. The cubic root of 231133421 is about 613.6973516145.

Adding to 231133421 its reverse (124331132), we get a palindrome (355464553).

The spelling of 231133421 in words is "two hundred thirty-one million, one hundred thirty-three thousand, four hundred twenty-one".