1311033421 has 32 divisors (see below), whose sum is σ = 1534896000. Its totient is φ = 1111283712.

The previous prime is 1311033397. The next prime is 1311033433. The reversal of 1311033421 is 1243301131.

It is not a de Polignac number, because 1311033421 - 2⁹ = 1311032909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311033461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 626545 + ... + 628633.

It is an arithmetic number, because the mean of its divisors is an integer number (47965500).

Almost surely, 2^1311033421 is an apocalyptic number.

It is an amenable number.

1311033421 is a deficient number, since it is larger than the sum of its proper divisors (223862579).

1311033421 is a wasteful number, since it uses less digits than its factorization.

1311033421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1311033421 is about 36208.1954949429. The cubic root of 1311033421 is about 1094.4718291248.

Adding to 1311033421 its reverse (1243301131), we get a palindrome (2554334552).

The spelling of 1311033421 in words is "one billion, three hundred eleven million, thirty-three thousand, four hundred twenty-one".