222749121 has 16 divisors (see below), whose sum is σ = 346650624. Its totient is φ = 124576464.

The previous prime is 222749101. The next prime is 222749123. The reversal of 222749121 is 121947222.

It is not a de Polignac number, because 222749121 - 2⁷ = 222748993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (222749123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111855 + ... + 113828.

It is an arithmetic number, because the mean of its divisors is an integer number (21665664).

Almost surely, 2^222749121 is an apocalyptic number.

222749121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

222749121 is a deficient number, since it is larger than the sum of its proper divisors (123901503).

222749121 is a wasteful number, since it uses less digits than its factorization.

222749121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225740.

The product of its digits is 4032, while the sum is 30.

The square root of 222749121 is about 14924.7821089623. The cubic root of 222749121 is about 606.1852057298.

The spelling of 222749121 in words is "two hundred twenty-two million, seven hundred forty-nine thousand, one hundred twenty-one".