1231321223031 has 4 divisors (see below), whose sum is σ = 1641761630712. Its totient is φ = 820880815352.

The previous prime is 1231321223023. The next prime is 1231321223039. The reversal of 1231321223031 is 1303221231321.

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

It is an interprime number because it is at equal distance from previous prime (1231321223023) and next prime (1231321223039).

It is a cyclic number.

It is not a de Polignac number, because 1231321223031 - 2³ = 1231321223023 is a prime.

It is a super-2 number, since 2×1231321223031² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1231321222992 and 1231321223010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231321223039) 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, 205220203836 + ... + 205220203841.

It is an arithmetic number, because the mean of its divisors is an integer number (410440407678).

Almost surely, 2^{1231321223031} is an apocalyptic number.

1231321223031 is a deficient number, since it is larger than the sum of its proper divisors (410440407681).

1231321223031 is an equidigital number, since it uses as much as digits as its factorization.

1231321223031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410440407680.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 1231321223031 its reverse (1303221231321), we get a palindrome (2534542454352).

The spelling of 1231321223031 in words is "one trillion, two hundred thirty-one billion, three hundred twenty-one million, two hundred twenty-three thousand, thirty-one".