1313270021 has 6 divisors (see below), whose sum is σ = 1527681510. Its totient is φ = 1125659976.

The previous prime is 1313269943. The next prime is 1313270029. The reversal of 1313270021 is 1200723131.

It can be written as a sum of positive squares in only one way, i.e., 1313265121 + 4900 = 36239^2 + 70^2 .

It is not a de Polignac number, because 1313270021 - 2¹⁰ = 1313268997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1313269975 and 1313270002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313270029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13400666 + ... + 13400763.

It is an arithmetic number, because the mean of its divisors is an integer number (254613585).

Almost surely, 2^1313270021 is an apocalyptic number.

It is an amenable number.

1313270021 is a deficient number, since it is larger than the sum of its proper divisors (214411489).

1313270021 is an equidigital number, since it uses as much as digits as its factorization.

1313270021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26801443 (or 26801436 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 1313270021 is about 36239.0676066590. The cubic root of 1313270021 is about 1095.0938587769.

Adding to 1313270021 its reverse (1200723131), we get a palindrome (2513993152).

The spelling of 1313270021 in words is "one billion, three hundred thirteen million, two hundred seventy thousand, twenty-one".