22064221 has 4 divisors (see below), whose sum is σ = 22150332. Its totient is φ = 21978112.

The previous prime is 22064213. The next prime is 22064233. The reversal of 22064221 is 12246022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12246022 = 2 ⋅6123011.

It can be written as a sum of positive squares in 2 ways, for example, as 21958596 + 105625 = 4686^2 + 325^2 .

It is a cyclic number.

It is not a de Polignac number, because 22064221 - 2³ = 22064213 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 (22064201) 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, 42670 + ... + 43183.

It is an arithmetic number, because the mean of its divisors is an integer number (5537583).

Almost surely, 2^22064221 is an apocalyptic number.

It is an amenable number.

22064221 is a deficient number, since it is larger than the sum of its proper divisors (86111).

22064221 is an equidigital number, since it uses as much as digits as its factorization.

22064221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86110.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 22064221 is about 4697.2567526164. The cubic root of 22064221 is about 280.4763193564.

The spelling of 22064221 in words is "twenty-two million, sixty-four thousand, two hundred twenty-one".