1313311021 has 4 divisors (see below), whose sum is σ = 1432702944. Its totient is φ = 1193919100.

The previous prime is 1313311003. The next prime is 1313311037. The reversal of 1313311021 is 1201133131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1313311021 - 2²⁹ = 776440109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1313310986 and 1313311004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313311061) 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, 59695945 + ... + 59695966.

It is an arithmetic number, because the mean of its divisors is an integer number (358175736).

Almost surely, 2^1313311021 is an apocalyptic number.

1313311021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1313311021 is a deficient number, since it is larger than the sum of its proper divisors (119391923).

1313311021 is a wasteful number, since it uses less digits than its factorization.

1313311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119391922.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1313311021 is about 36239.6332900872. The cubic root of 1313311021 is about 1095.1052548545.

Adding to 1313311021 its reverse (1201133131), we get a palindrome (2514444152).

It can be divided in two parts, 13133110 and 21, that added together give a palindrome (13133131).

The spelling of 1313311021 in words is "one billion, three hundred thirteen million, three hundred eleven thousand, twenty-one".