1313020021 has 8 divisors (see below), whose sum is σ = 1374791040. Its totient is φ = 1251639312.

The previous prime is 1313020013. The next prime is 1313020031. The reversal of 1313020021 is 1200203131.

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 1313020021 - 2³ = 1313020013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1313019983 and 1313020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313020031) 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, 90681 + ... + 104158.

It is an arithmetic number, because the mean of its divisors is an integer number (171848880).

Almost surely, 2^1313020021 is an apocalyptic number.

It is an amenable number.

1313020021 is a deficient number, since it is larger than the sum of its proper divisors (61771019).

1313020021 is a wasteful number, since it uses less digits than its factorization.

1313020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195155.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1313020021 is about 36235.6181263684. The cubic root of 1313020021 is about 1095.0243653662.

Adding to 1313020021 its reverse (1200203131), we get a palindrome (2513223152).

The spelling of 1313020021 in words is "one billion, three hundred thirteen million, twenty thousand, twenty-one".