2222021 has 4 divisors (see below), whose sum is σ = 2236332. Its totient is φ = 2207712.

The previous prime is 2221997. The next prime is 2222023. The reversal of 2222021 is 1202222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 748225 + 1473796 = 865^2 + 1214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2222021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221993 and 2222011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2222023) 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, 6920 + ... + 7233.

It is an arithmetic number, because the mean of its divisors is an integer number (559083).

2^2222021 is an apocalyptic number.

It is an amenable number.

2222021 is a deficient number, since it is larger than the sum of its proper divisors (14311).

2222021 is a wasteful number, since it uses less digits than its factorization.

2222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14310.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 2222021 is about 1490.6444914868. The cubic root of 2222021 is about 130.4916491282.

Adding to 2222021 its reverse (1202222), we get a palindrome (3424243).

The spelling of 2222021 in words is "two million, two hundred twenty-two thousand, twenty-one".