2021131313 has 4 divisors (see below), whose sum is σ = 2051297520. Its totient is φ = 1990965108.

The previous prime is 2021131303. The next prime is 2021131337. The reversal of 2021131313 is 3131311202.

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 a cyclic number.

It is not a de Polignac number, because 2021131313 - 2¹² = 2021127217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021131291 and 2021131300.

It is not an unprimeable number, because it can be changed into a prime (2021131303) 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, 15083003 + ... + 15083136.

It is an arithmetic number, because the mean of its divisors is an integer number (512824380).

Almost surely, 2^2021131313 is an apocalyptic number.

It is an amenable number.

2021131313 is a deficient number, since it is larger than the sum of its proper divisors (30166207).

2021131313 is an equidigital number, since it uses as much as digits as its factorization.

2021131313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30166206.

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

The square root of 2021131313 is about 44956.9940387477. The cubic root of 2021131313 is about 1264.3428110075.

Adding to 2021131313 its reverse (3131311202), we get a palindrome (5152442515).

The spelling of 2021131313 in words is "two billion, twenty-one million, one hundred thirty-one thousand, three hundred thirteen".