222121445 has 32 divisors (see below), whose sum is σ = 335715072. Its totient is φ = 137313792.

The previous prime is 222121433. The next prime is 222121451. The reversal of 222121445 is 544121222.

It is not a de Polignac number, because 222121445 - 2⁴ = 222121429 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 222121445.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13889 + ... + 25241.

It is an arithmetic number, because the mean of its divisors is an integer number (10491096).

Almost surely, 2^222121445 is an apocalyptic number.

It is an amenable number.

222121445 is a deficient number, since it is larger than the sum of its proper divisors (113593627).

222121445 is a wasteful number, since it uses less digits than its factorization.

222121445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11421.

The product of its digits is 1280, while the sum is 23.

The square root of 222121445 is about 14903.7392958948. The cubic root of 222121445 is about 605.6152882499.

Adding to 222121445 its reverse (544121222), we get a palindrome (766242667).

The spelling of 222121445 in words is "two hundred twenty-two million, one hundred twenty-one thousand, four hundred forty-five".