222221000 has 64 divisors (see below), whose sum is σ = 522288000. Its totient is φ = 88497600.

The previous prime is 222220993. The next prime is 222221047. The reversal of 222221000 is 122222.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 358691 + ... + 359309.

It is an arithmetic number, because the mean of its divisors is an integer number (8160750).

Almost surely, 2^222221000 is an apocalyptic number.

222221000 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 222221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261144000).

222221000 is an abundant number, since it is smaller than the sum of its proper divisors (300067000).

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

222221000 is a wasteful number, since it uses less digits than its factorization.

222221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999 (or 985 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 222221000 is about 14907.0788553626. The cubic root of 222221000 is about 605.7057538128.

Adding to 222221000 its reverse (122222), we get a palindrome (222343222).

The spelling of 222221000 in words is "two hundred twenty-two million, two hundred twenty-one thousand".