231301223221 has 48 divisors (see below), whose sum is σ = 248658096960. Its totient is φ = 215053977600.

The previous prime is 231301223213. The next prime is 231301223227. The reversal of 231301223221 is 122322103132.

231301223221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231301223221 - 2³ = 231301223213 is a prime.

It is a super-2 number, since 2×231301223221² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231301223192 and 231301223201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231301223227) 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 47 ways as a sum of consecutive naturals, for example, 552031350 + ... + 552031768.

It is an arithmetic number, because the mean of its divisors is an integer number (5180377020).

Almost surely, 2^231301223221 is an apocalyptic number.

It is an amenable number.

231301223221 is a deficient number, since it is larger than the sum of its proper divisors (17356873739).

231301223221 is a wasteful number, since it uses less digits than its factorization.

231301223221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742 (or 713 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 231301223221 its reverse (122322103132), we get a palindrome (353623326353).

The spelling of 231301223221 in words is "two hundred thirty-one billion, three hundred one million, two hundred twenty-three thousand, two hundred twenty-one".