231220330333321 has 4 divisors (see below), whose sum is σ = 264251806095232. Its totient is φ = 198188854571412.

The previous prime is 231220330333283. The next prime is 231220330333357. The reversal of 231220330333321 is 123333033022132.

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 231220330333321 - 2⁷ = 231220330333193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231220330333121) 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, 16515737880945 + ... + 16515737880958.

It is an arithmetic number, because the mean of its divisors is an integer number (66062951523808).

Almost surely, 2^{231220330333321} is an apocalyptic number.

It is an amenable number.

231220330333321 is a deficient number, since it is larger than the sum of its proper divisors (33031475761911).

231220330333321 is an equidigital number, since it uses as much as digits as its factorization.

231220330333321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33031475761910.

The product of its (nonzero) digits is 34992, while the sum is 31.

Adding to 231220330333321 its reverse (123333033022132), we get a palindrome (354553363355453).

The spelling of 231220330333321 in words is "two hundred thirty-one trillion, two hundred twenty billion, three hundred thirty million, three hundred thirty-three thousand, three hundred twenty-one".