1313321021 has 8 divisors (see below), whose sum is σ = 1383439200. Its totient is φ = 1243302480.

The previous prime is 1313321017. The next prime is 1313321039. The reversal of 1313321021 is 1201233131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1313321021 - 2² = 1313321017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313321041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2966 + ... + 51336.

It is an arithmetic number, because the mean of its divisors is an integer number (172929900).

Almost surely, 2^1313321021 is an apocalyptic number.

It is an amenable number.

1313321021 is a deficient number, since it is larger than the sum of its proper divisors (70118179).

1313321021 is a wasteful number, since it uses less digits than its factorization.

1313321021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49819.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1313321021 is about 36239.7712603156. The cubic root of 1313321021 is about 1095.1080343496.

Adding to 1313321021 its reverse (1201233131), we get a palindrome (2514554152).

The spelling of 1313321021 in words is "one billion, three hundred thirteen million, three hundred twenty-one thousand, twenty-one".