222888921 has 16 divisors (see below), whose sum is σ = 317789568. Its totient is φ = 138464000.

The previous prime is 222888907. The next prime is 222888923. The reversal of 222888921 is 129888222.

It is a cyclic number.

It is not a de Polignac number, because 222888921 - 2⁹ = 222888409 is a prime.

It is a super-2 number, since 2×222888921² = 99358942209088482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (222888923) 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, 16485 + ... + 26786.

It is an arithmetic number, because the mean of its divisors is an integer number (19861848).

Almost surely, 2^222888921 is an apocalyptic number.

It is an amenable number.

222888921 is a deficient number, since it is larger than the sum of its proper divisors (94900647).

222888921 is a wasteful number, since it uses less digits than its factorization.

222888921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43392.

The product of its digits is 73728, while the sum is 42.

The square root of 222888921 is about 14929.4648597999. The cubic root of 222888921 is about 606.3119955590.

The spelling of 222888921 in words is "two hundred twenty-two million, eight hundred eighty-eight thousand, nine hundred twenty-one".