22221100 has 36 divisors (see below), whose sum is σ = 52606008. Its totient is φ = 8080000.

The previous prime is 22221097. The next prime is 22221109. The reversal of 22221100 is 112222.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (22221109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9001 + ... + 11200.

It is an arithmetic number, because the mean of its divisors is an integer number (1461278).

Almost surely, 2^22221100 is an apocalyptic number.

22221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22221100 is an abundant number, since it is smaller than the sum of its proper divisors (30384908).

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

22221100 is a wasteful number, since it uses less digits than its factorization.

22221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20226 (or 20219 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 22221100 is about 4713.9261767660. The cubic root of 22221100 is about 281.1394890932.

Adding to 22221100 its reverse (112222), we get a palindrome (22333322).

It can be divided in two parts, 22 and 221100, that added together give a palindrome (221122).

The spelling of 22221100 in words is "twenty-two million, two hundred twenty-one thousand, one hundred".