2221021 has 4 divisors (see below), whose sum is σ = 2422944. Its totient is φ = 2019100.

The previous prime is 2221019. The next prime is 2221031. The reversal of 2221021 is 1201222.

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 2221021 - 2¹ = 2221019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2220989 and 2221007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221031) 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 3 ways as a sum of consecutive naturals, for example, 100945 + ... + 100966.

It is an arithmetic number, because the mean of its divisors is an integer number (605736).

2^2221021 is an apocalyptic number.

It is an amenable number.

2221021 is a deficient number, since it is larger than the sum of its proper divisors (201923).

2221021 is a wasteful number, since it uses less digits than its factorization.

2221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201922.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2221021 is about 1490.3090283562. The cubic root of 2221021 is about 130.4720706710.

Adding to 2221021 its reverse (1201222), we get a palindrome (3422243).

The spelling of 2221021 in words is "two million, two hundred twenty-one thousand, twenty-one".