2021020013 has 4 divisors (see below), whose sum is σ = 2022001728. Its totient is φ = 2020038300.

The previous prime is 2021020007. The next prime is 2021020021. The reversal of 2021020013 is 3100201202.

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 2021020013 - 2⁴ = 2021019997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021019976 and 2021020003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021020003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487763 + ... + 491888.

It is an arithmetic number, because the mean of its divisors is an integer number (505500432).

Almost surely, 2^2021020013 is an apocalyptic number.

It is an amenable number.

2021020013 is a deficient number, since it is larger than the sum of its proper divisors (981715).

2021020013 is an equidigital number, since it uses as much as digits as its factorization.

2021020013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981714.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 2021020013 is about 44955.7561720410. The cubic root of 2021020013 is about 1264.3196022337.

Adding to 2021020013 its reverse (3100201202), we get a palindrome (5121221215).

The spelling of 2021020013 in words is "two billion, twenty-one million, twenty thousand, thirteen".