1321311020231 has 8 divisors (see below), whose sum is σ = 1324349389584. Its totient is φ = 1318274063680.

The previous prime is 1321311020213. The next prime is 1321311020261. The reversal of 1321311020231 is 1320201131231.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321311020231 - 2¹⁰ = 1321311019207 is a prime.

It is a super-2 number, since 2×1321311020231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321311020261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1530965 + ... + 2233041.

It is an arithmetic number, because the mean of its divisors is an integer number (165543673698).

Almost surely, 2^{1321311020231} is an apocalyptic number.

1321311020231 is a deficient number, since it is larger than the sum of its proper divisors (3038369353).

1321311020231 is an equidigital number, since it uses as much as digits as its factorization.

1321311020231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706401.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1321311020231 its reverse (1320201131231), we get a palindrome (2641512151462).

The spelling of 1321311020231 in words is "one trillion, three hundred twenty-one billion, three hundred eleven million, twenty thousand, two hundred thirty-one".