2021013 has 12 divisors (see below), whose sum is σ = 2990988. Its totient is φ = 1314240.

The previous prime is 2021009. The next prime is 2021017. The reversal of 2021013 is 3101202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2021009) and next prime (2021017).

It can be written as a sum of positive squares in 2 ways, for example, as 1205604 + 815409 = 1098^2 + 903^2 .

It is not a de Polignac number, because 2021013 - 2² = 2021009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 2020986 and 2021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2370 + ... + 3107.

It is an arithmetic number, because the mean of its divisors is an integer number (249249).

2^2021013 is an apocalyptic number.

It is an amenable number.

2021013 is a deficient number, since it is larger than the sum of its proper divisors (969975).

2021013 is a wasteful number, since it uses less digits than its factorization.

2021013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5524 (or 5521 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 2021013 is about 1421.6233678440. The cubic root of 2021013 is about 126.4318139823.

Adding to 2021013 its reverse (3101202), we get a palindrome (5122215).

The spelling of 2021013 in words is "two million, twenty-one thousand, thirteen".