22210021 has 4 divisors (see below), whose sum is σ = 22629132. Its totient is φ = 21790912.

The previous prime is 22209997. The next prime is 22210033. The reversal of 22210021 is 12001222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12001222 = 2 ⋅6000611.

It can be written as a sum of positive squares in 2 ways, for example, as 15319396 + 6890625 = 3914^2 + 2625^2 .

It is a cyclic number.

It is not a de Polignac number, because 22210021 - 2⁵ = 22209989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22210051) 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, 209476 + ... + 209581.

It is an arithmetic number, because the mean of its divisors is an integer number (5657283).

Almost surely, 2^22210021 is an apocalyptic number.

It is an amenable number.

22210021 is a deficient number, since it is larger than the sum of its proper divisors (419111).

22210021 is an equidigital number, since it uses as much as digits as its factorization.

22210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419110.

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

The square root of 22210021 is about 4712.7508951779. The cubic root of 22210021 is about 281.0927578004.

Adding to 22210021 its reverse (12001222), we get a palindrome (34211243).

The spelling of 22210021 in words is "twenty-two million, two hundred ten thousand, twenty-one".