2021320013 has 4 divisors (see below), whose sum is σ = 2031477600. Its totient is φ = 2011162428.

The previous prime is 2021319947. The next prime is 2021320033. The reversal of 2021320013 is 3100231202.

It is a happy number.

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 2021320013 - 2¹⁴ = 2021303629 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021320013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021320033) 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, 5078495 + ... + 5078892.

It is an arithmetic number, because the mean of its divisors is an integer number (507869400).

Almost surely, 2^2021320013 is an apocalyptic number.

It is an amenable number.

2021320013 is a deficient number, since it is larger than the sum of its proper divisors (10157587).

2021320013 is a wasteful number, since it uses less digits than its factorization.

2021320013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10157586.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 2021320013 is about 44959.0926621079. The cubic root of 2021320013 is about 1264.3821576286.

Adding to 2021320013 its reverse (3100231202), we get a palindrome (5121551215).

The spelling of 2021320013 in words is "two billion, twenty-one million, three hundred twenty thousand, thirteen".