1321213221131 has 4 divisors (see below), whose sum is σ = 1337937439200. Its totient is φ = 1304489003064.

The previous prime is 1321213221089. The next prime is 1321213221143. The reversal of 1321213221131 is 1311223121231.

It is a happy number.

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 1321213221131 - 2¹⁴ = 1321213204747 is a prime.

It is a super-2 number, since 2×1321213221131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321213221097 and 1321213221106.

It is not an unprimeable number, because it can be changed into a prime (1321213221631) 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, 8362108916 + ... + 8362109073.

It is an arithmetic number, because the mean of its divisors is an integer number (334484359800).

Almost surely, 2^{1321213221131} is an apocalyptic number.

1321213221131 is a deficient number, since it is larger than the sum of its proper divisors (16724218069).

1321213221131 is an equidigital number, since it uses as much as digits as its factorization.

1321213221131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16724218068.

The product of its digits is 432, while the sum is 23.

Adding to 1321213221131 its reverse (1311223121231), we get a palindrome (2632436342362).

The spelling of 1321213221131 in words is "one trillion, three hundred twenty-one billion, two hundred thirteen million, two hundred twenty-one thousand, one hundred thirty-one".