1321023131213 has 4 divisors (see below), whose sum is σ = 1321026939420. Its totient is φ = 1321019323008.

The previous prime is 1321023131201. The next prime is 1321023131231. The reversal of 1321023131213 is 3121313201231.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1133826724969 + 187196406244 = 1064813^2 + 432662^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321023131213 - 2⁶ = 1321023131149 is a prime.

It is a super-2 number, since 2×1321023131213² (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 (1321023181213) 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, 1325078 + ... + 2097111.

It is an arithmetic number, because the mean of its divisors is an integer number (330256734855).

Almost surely, 2^{1321023131213} is an apocalyptic number.

It is an amenable number.

1321023131213 is a deficient number, since it is larger than the sum of its proper divisors (3808207).

1321023131213 is an equidigital number, since it uses as much as digits as its factorization.

1321023131213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3808206.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1321023131213 its reverse (3121313201231), we get a palindrome (4442336332444).

The spelling of 1321023131213 in words is "one trillion, three hundred twenty-one billion, twenty-three million, one hundred thirty-one thousand, two hundred thirteen".