1331206021331 has 4 divisors (see below), whose sum is σ = 1333172352912. Its totient is φ = 1329239689752.

The previous prime is 1331206021319. The next prime is 1331206021373.

1331206021331 is nontrivially palindromic in base 10.

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 1331206021331 - 2³⁰ = 1330132279507 is a prime.

It is a super-2 number, since 2×1331206021331² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331206021331.

It is not an unprimeable number, because it can be changed into a prime (1331206021631) 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, 983164775 + ... + 983166128.

It is an arithmetic number, because the mean of its divisors is an integer number (333293088228).

Almost surely, 2^{1331206021331} is an apocalyptic number.

1331206021331 is a deficient number, since it is larger than the sum of its proper divisors (1966331581).

1331206021331 is an equidigital number, since it uses as much as digits as its factorization.

1331206021331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966331580.

The product of its (nonzero) digits is 1944, while the sum is 26.

The spelling of 1331206021331 in words is "one trillion, three hundred thirty-one billion, two hundred six million, twenty-one thousand, three hundred thirty-one".