222001000 has 64 divisors (see below), whose sum is σ = 559475280. Its totient is φ = 81964800.

The previous prime is 222000967. The next prime is 222001001. The reversal of 222001000 is 100222.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 527076 + 221473924 = 726^2 + 14882^2 .

It is not an unprimeable number, because it can be changed into a prime (222001001) 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 15 ways as a sum of consecutive naturals, for example, 4462 + ... + 21538.

Almost surely, 2^222001000 is an apocalyptic number.

222001000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222001000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279737640).

222001000 is an abundant number, since it is smaller than the sum of its proper divisors (337474280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

222001000 is a wasteful number, since it uses less digits than its factorization.

222001000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17111 (or 17097 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 222001000 is about 14899.6979835163. The cubic root of 222001000 is about 605.5058038163.

Adding to 222001000 its reverse (100222), we get a palindrome (222101222).

The spelling of 222001000 in words is "two hundred twenty-two million, one thousand".