231320220223121 has 4 divisors (see below), whose sum is σ = 233566047604032. Its totient is φ = 229074392842212.

The previous prime is 231320220223111. The next prime is 231320220223159. The reversal of 231320220223121 is 121322022023132.

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 231320220223121 - 2¹⁰ = 231320220222097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231320220223111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1122913690301 + ... + 1122913690506.

It is an arithmetic number, because the mean of its divisors is an integer number (58391511901008).

Almost surely, 2^{231320220223121} is an apocalyptic number.

It is an amenable number.

231320220223121 is a deficient number, since it is larger than the sum of its proper divisors (2245827380911).

231320220223121 is a wasteful number, since it uses less digits than its factorization.

231320220223121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2245827380910.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 231320220223121 its reverse (121322022023132), we get a palindrome (352642242246253).

The spelling of 231320220223121 in words is "two hundred thirty-one trillion, three hundred twenty billion, two hundred twenty million, two hundred twenty-three thousand, one hundred twenty-one".