222559921 has 8 divisors (see below), whose sum is σ = 228969000. Its totient is φ = 216171648.

The previous prime is 222559919. The next prime is 222559927. The reversal of 222559921 is 129955222.

It can be written as a sum of positive squares in 4 ways, for example, as 2927521 + 219632400 = 1711^2 + 14820^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 222559921 - 2¹ = 222559919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222559927) 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 7 ways as a sum of consecutive naturals, for example, 17955 + ... + 27703.

It is an arithmetic number, because the mean of its divisors is an integer number (28621125).

Almost surely, 2^222559921 is an apocalyptic number.

It is an amenable number.

222559921 is a deficient number, since it is larger than the sum of its proper divisors (6409079).

222559921 is an equidigital number, since it uses as much as digits as its factorization.

222559921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10403.

The product of its digits is 32400, while the sum is 37.

The square root of 222559921 is about 14918.4423114479. The cubic root of 222559921 is about 606.0135286911.

The spelling of 222559921 in words is "two hundred twenty-two million, five hundred fifty-nine thousand, nine hundred twenty-one".