222604021 has 4 divisors (see below), whose sum is σ = 222918700. Its totient is φ = 222289344.

The previous prime is 222604013. The next prime is 222604033. The reversal of 222604021 is 120406222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120406222 = 2 ⋅60203111.

It can be written as a sum of positive squares in 2 ways, for example, as 88623396 + 133980625 = 9414^2 + 11575^2 .

It is a cyclic number.

It is not a de Polignac number, because 222604021 - 2³ = 222604013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 222604021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222604061) 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, 156276 + ... + 157693.

It is an arithmetic number, because the mean of its divisors is an integer number (55729675).

Almost surely, 2^222604021 is an apocalyptic number.

It is an amenable number.

222604021 is a deficient number, since it is larger than the sum of its proper divisors (314679).

222604021 is an equidigital number, since it uses as much as digits as its factorization.

222604021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314678.

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

The square root of 222604021 is about 14919.9202745859. The cubic root of 222604021 is about 606.0535530158.

The spelling of 222604021 in words is "two hundred twenty-two million, six hundred four thousand, twenty-one".