222555121 has 4 divisors (see below), whose sum is σ = 225236592. Its totient is φ = 219873652.

The previous prime is 222555119. The next prime is 222555133. The reversal of 222555121 is 121555222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 222555121 - 2¹ = 222555119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222555101) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1340611 + ... + 1340776.

It is an arithmetic number, because the mean of its divisors is an integer number (56309148).

Almost surely, 2^222555121 is an apocalyptic number.

It is an amenable number.

222555121 is a deficient number, since it is larger than the sum of its proper divisors (2681471).

222555121 is an equidigital number, since it uses as much as digits as its factorization.

222555121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2681470.

The product of its digits is 2000, while the sum is 25.

The square root of 222555121 is about 14918.2814358759. The cubic root of 222555121 is about 606.0091719830.

The spelling of 222555121 in words is "two hundred twenty-two million, five hundred fifty-five thousand, one hundred twenty-one".