1321320120131 has 16 divisors (see below), whose sum is σ = 1442475889920. Its totient is φ = 1200337343520.

The previous prime is 1321320120103. The next prime is 1321320120203. The reversal of 1321320120131 is 1310210231231.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321320120131 is a prime.

It is a super-2 number, since 2×1321320120131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321320120101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110481530 + ... + 110493488.

It is an arithmetic number, because the mean of its divisors is an integer number (90154743120).

Almost surely, 2^{1321320120131} is an apocalyptic number.

1321320120131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1321320120131 is a deficient number, since it is larger than the sum of its proper divisors (121155769789).

1321320120131 is a wasteful number, since it uses less digits than its factorization.

1321320120131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18346.

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

Adding to 1321320120131 its reverse (1310210231231), we get a palindrome (2631530351362).

The spelling of 1321320120131 in words is "one trillion, three hundred twenty-one billion, three hundred twenty million, one hundred twenty thousand, one hundred thirty-one".