222221100 has 36 divisors (see below), whose sum is σ = 642960584. Its totient is φ = 59258880.

The previous prime is 222221071. The next prime is 222221137. The reversal of 222221100 is 1122222.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 370069 + ... + 370668.

Almost surely, 2^222221100 is an apocalyptic number.

222221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

222221100 is an abundant number, since it is smaller than the sum of its proper divisors (420739484).

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

222221100 is a wasteful number, since it uses less digits than its factorization.

222221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740754 (or 740747 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 222221100 is about 14907.0822094735. The cubic root of 222221100 is about 605.7058446691.

Adding to 222221100 its reverse (1122222), we get a palindrome (223343322).

The spelling of 222221100 in words is "two hundred twenty-two million, two hundred twenty-one thousand, one hundred".