1321120311031 has 4 divisors (see below), whose sum is σ = 1390652959000. Its totient is φ = 1251587663064.

The previous prime is 1321120310981. The next prime is 1321120311047. The reversal of 1321120311031 is 1301130211231.

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 1321120311031 - 2⁷ = 1321120310903 is a prime.

It is a super-2 number, since 2×1321120311031² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 69532647949 = 1321120311031 / (1 + 3 + 2 + 1 + 1 + 2 + 0 + 3 + 1 + 1 + 0 + 3 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321126311031) 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, 34766323956 + ... + 34766323993.

It is an arithmetic number, because the mean of its divisors is an integer number (347663239750).

Almost surely, 2^{1321120311031} is an apocalyptic number.

1321120311031 is a deficient number, since it is larger than the sum of its proper divisors (69532647969).

1321120311031 is an equidigital number, since it uses as much as digits as its factorization.

1321120311031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69532647968.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 1321120311031 its reverse (1301130211231), we get a palindrome (2622250522262).

The spelling of 1321120311031 in words is "one trillion, three hundred twenty-one billion, one hundred twenty million, three hundred eleven thousand, thirty-one".