12222100 has 72 divisors (see below), whose sum is σ = 29748096. Its totient is φ = 4320000.

The previous prime is 12222053. The next prime is 12222101. The reversal of 12222100 is 122221.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12222101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44965 + ... + 45235.

It is an arithmetic number, because the mean of its divisors is an integer number (413168).

Almost surely, 2^12222100 is an apocalyptic number.

12222100 is a gapful number since it is divisible by the number (10) 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 12222100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14874048).

12222100 is an abundant number, since it is smaller than the sum of its proper divisors (17525996).

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

12222100 is a wasteful number, since it uses less digits than its factorization.

12222100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 330 counting only the distinct ones).

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

The square root of 12222100 is about 3496.0120137093. The cubic root of 12222100 is about 230.3466731730.

Adding to 12222100 its reverse (122221), we get a palindrome (12344321).

Multiplying 12222100 by its reverse (122221), we get a square (1493797284100 = 1222210²).

12222100 divided by its reverse (122221) gives a square (100 = 10²).

It can be divided in two parts, 122 and 22100, that added together give a palindrome (22222).

The spelling of 12222100 in words is "twelve million, two hundred twenty-two thousand, one hundred".