1220331323231 has 4 divisors (see below), whose sum is σ = 1227638696592. Its totient is φ = 1213023949872.

The previous prime is 1220331323207. The next prime is 1220331323243. The reversal of 1220331323231 is 1323231330221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1220331323231 - 2³⁸ = 945453416287 is a prime.

It is a super-2 number, since 2×1220331323231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220331323231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220331323831) 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, 3653686430 + ... + 3653686763.

It is an arithmetic number, because the mean of its divisors is an integer number (306909674148).

Almost surely, 2^{1220331323231} is an apocalyptic number.

1220331323231 is a deficient number, since it is larger than the sum of its proper divisors (7307373361).

1220331323231 is an equidigital number, since it uses as much as digits as its factorization.

1220331323231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7307373360.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 1220331323231 its reverse (1323231330221), we get a palindrome (2543562653452).

The spelling of 1220331323231 in words is "one trillion, two hundred twenty billion, three hundred thirty-one million, three hundred twenty-three thousand, two hundred thirty-one".