1311332443421 has 32 divisors (see below), whose sum is σ = 1763524562688. Its totient is φ = 941686986240.

The previous prime is 1311332443381. The next prime is 1311332443429. The reversal of 1311332443421 is 1243442331131.

It is a de Polignac number, because none of the positive numbers 2^k-1311332443421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311332443429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 443990 + ... + 1679223.

It is an arithmetic number, because the mean of its divisors is an integer number (55110142584).

Almost surely, 2^{1311332443421} is an apocalyptic number.

1311332443421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1311332443421 is a deficient number, since it is larger than the sum of its proper divisors (452192119267).

1311332443421 is a wasteful number, since it uses less digits than its factorization.

1311332443421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2123861.

The product of its digits is 20736, while the sum is 32.

Adding to 1311332443421 its reverse (1243442331131), we get a palindrome (2554774774552).

The spelling of 1311332443421 in words is "one trillion, three hundred eleven billion, three hundred thirty-two million, four hundred forty-three thousand, four hundred twenty-one".