1311303021 has 16 divisors (see below), whose sum is σ = 2000252544. Its totient is φ = 748537344.

The previous prime is 1311303001. The next prime is 1311303023. The reversal of 1311303021 is 1203031131.

It is not a de Polignac number, because 1311303021 - 2⁵ = 1311302989 is a prime.

It is a super-2 number, since 2×1311303021² = 3439031225767452882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311303023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11440 + ... + 52473.

It is an arithmetic number, because the mean of its divisors is an integer number (125015784).

Almost surely, 2^1311303021 is an apocalyptic number.

It is an amenable number.

1311303021 is a deficient number, since it is larger than the sum of its proper divisors (688949523).

1311303021 is an equidigital number, since it uses as much as digits as its factorization.

1311303021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64900.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 1311303021 is about 36211.9182176255. The cubic root of 1311303021 is about 1094.5468461245.

Adding to 1311303021 its reverse (1203031131), we get a palindrome (2514334152).

The spelling of 1311303021 in words is "one billion, three hundred eleven million, three hundred three thousand, twenty-one".