22220100 has 108 divisors (see below), whose sum is σ = 79619904. Its totient is φ = 5077440.

The previous prime is 22220083. The next prime is 22220113. The reversal of 22220100 is 102222.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4537 + ... + 8063.

Almost surely, 2^22220100 is an apocalyptic number.

22220100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

22220100 is the 2520-th nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22220100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39809952).

22220100 is an abundant number, since it is smaller than the sum of its proper divisors (57399804).

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

22220100 is a wasteful number, since it uses less digits than its factorization.

22220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3554 (or 3544 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 22220100 is about 4713.8201068772. The cubic root of 22220100 is about 281.1352717246.

Adding to 22220100 its reverse (102222), we get a palindrome (22322322).

The spelling of 22220100 in words is "twenty-two million, two hundred twenty thousand, one hundred".