231312220021223 has 16 divisors (see below), whose sum is σ = 278800871567616. Its totient is φ = 189309233773440.

The previous prime is 231312220021217. The next prime is 231312220021343. The reversal of 231312220021223 is 322120022213132.

It is not a de Polignac number, because 231312220021223 - 2¹² = 231312220017127 is a prime.

It is a super-2 number, since 2×231312220021223² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231312220021192 and 231312220021201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231312220023223) 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 15 ways as a sum of consecutive naturals, for example, 26890511861 + ... + 26890520462.

It is an arithmetic number, because the mean of its divisors is an integer number (17425054472976).

Almost surely, 2^{231312220021223} is an apocalyptic number.

231312220021223 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

231312220021223 is a deficient number, since it is larger than the sum of its proper divisors (47488651546393).

231312220021223 is a wasteful number, since it uses less digits than its factorization.

231312220021223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53781032374.

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

Adding to 231312220021223 its reverse (322120022213132), we get a palindrome (553432242234355).

The spelling of 231312220021223 in words is "two hundred thirty-one trillion, three hundred twelve billion, two hundred twenty million, twenty-one thousand, two hundred twenty-three".