1331434321213 has 4 divisors (see below), whose sum is σ = 1335978465948. Its totient is φ = 1326890176480.

The previous prime is 1331434321187. The next prime is 1331434321241. The reversal of 1331434321213 is 3121234341331.

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 1185404870169 + 146029451044 = 1088763^2 + 382138^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331434321213 - 2²¹ = 1331432224061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331434351213) 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, 2272071928 + ... + 2272072513.

It is an arithmetic number, because the mean of its divisors is an integer number (333994616487).

Almost surely, 2^{1331434321213} is an apocalyptic number.

It is an amenable number.

1331434321213 is a deficient number, since it is larger than the sum of its proper divisors (4544144735).

1331434321213 is an equidigital number, since it uses as much as digits as its factorization.

1331434321213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4544144734.

The product of its digits is 15552, while the sum is 31.

Adding to 1331434321213 its reverse (3121234341331), we get a palindrome (4452668662544).

The spelling of 1331434321213 in words is "one trillion, three hundred thirty-one billion, four hundred thirty-four million, three hundred twenty-one thousand, two hundred thirteen".