22100000 has 144 divisors (see below), whose sum is σ = 62011656. Its totient is φ = 7680000.

The previous prime is 22099999. The next prime is 22100041. The reversal of 22100000 is 122.

It can be written as a sum of positive squares in 12 ways, for example, as 11262736 + 10837264 = 3356^2 + 3292^2 .

It is a Harshad number since it is a multiple of its sum of digits (5).

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1299992 + ... + 1300008.

Almost surely, 2^22100000 is an apocalyptic number.

22100000 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 22100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31005828).

22100000 is an abundant number, since it is smaller than the sum of its proper divisors (39911656).

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

22100000 is an equidigital number, since it uses as much as digits as its factorization.

22100000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65 (or 37 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 5.

The square root of 22100000 is about 4701.0637094173. The cubic root of 22100000 is about 280.6278428390.

Adding to 22100000 its reverse (122), we get a palindrome (22100122).

The spelling of 22100000 in words is "twenty-two million, one hundred thousand".