220331231231 has 2 divisors, whose sum is σ = 220331231232. Its totient is φ = 220331231230.

The previous prime is 220331231149. The next prime is 220331231251. The reversal of 220331231231 is 132132133022.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 220331231231 - 2²⁶ = 220264122367 is a prime.

It is a super-2 number, since 2×220331231231² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 220331231197 and 220331231206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220331231251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110165615615 + 110165615616.

It is an arithmetic number, because the mean of its divisors is an integer number (110165615616).

Almost surely, 2^220331231231 is an apocalyptic number.

220331231231 is a deficient number, since it is larger than the sum of its proper divisors (1).

220331231231 is an equidigital number, since it uses as much as digits as its factorization.

220331231231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 220331231231 its reverse (132132133022), we get a palindrome (352463364253).

The spelling of 220331231231 in words is "two hundred twenty billion, three hundred thirty-one million, two hundred thirty-one thousand, two hundred thirty-one".