2021041021 has 4 divisors (see below), whose sum is σ = 2022052032. Its totient is φ = 2020030012.

The previous prime is 2021041013. The next prime is 2021041051. The reversal of 2021041021 is 1201401202.

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 2021041021 - 2³ = 2021041013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021040992 and 2021041010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021041051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502501 + ... + 506506.

It is an arithmetic number, because the mean of its divisors is an integer number (505513008).

Almost surely, 2^2021041021 is an apocalyptic number.

It is an amenable number.

2021041021 is a deficient number, since it is larger than the sum of its proper divisors (1011011).

2021041021 is a wasteful number, since it uses less digits than its factorization.

2021041021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011010.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2021041021 is about 44955.9898233817. The cubic root of 2021041021 is about 1264.3239829811.

Adding to 2021041021 its reverse (1201401202), we get a palindrome (3222442223).

The spelling of 2021041021 in words is "two billion, twenty-one million, forty-one thousand, twenty-one".