1321313011 has 4 divisors (see below), whose sum is σ = 1330819000. Its totient is φ = 1311807024.

The previous prime is 1321312997. The next prime is 1321313033. The reversal of 1321313011 is 1103131231.

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 1321313011 - 2¹⁹ = 1320788723 is a prime.

It is a super-2 number, since 2×1321313011² = 3491736146075772242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321313041) 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, 4752786 + ... + 4753063.

It is an arithmetic number, because the mean of its divisors is an integer number (332704750).

Almost surely, 2^1321313011 is an apocalyptic number.

1321313011 is a deficient number, since it is larger than the sum of its proper divisors (9505989).

1321313011 is an equidigital number, since it uses as much as digits as its factorization.

1321313011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9505988.

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

The square root of 1321313011 is about 36349.8694770697. The cubic root of 1321313011 is about 1097.3249077001.

Adding to 1321313011 its reverse (1103131231), we get a palindrome (2424444242).

The spelling of 1321313011 in words is "one billion, three hundred twenty-one million, three hundred thirteen thousand, eleven".