12221110 has 32 divisors (see below), whose sum is σ = 24149664. Its totient is φ = 4416000.

The previous prime is 12221107. The next prime is 12221117. The reversal of 12221110 is 1112221.

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 (12221117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26280 + ... + 26740.

It is an arithmetic number, because the mean of its divisors is an integer number (754677).

Almost surely, 2^12221110 is an apocalyptic number.

12221110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12221110 is a deficient number, since it is larger than the sum of its proper divisors (11928554).

12221110 is a wasteful number, since it uses less digits than its factorization.

12221110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 12221110 is about 3495.8704209395. The cubic root of 12221110 is about 230.3404535827.

Adding to 12221110 its reverse (1112221), we get a palindrome (13333331).

Subtracting from 12221110 its reverse (1112221), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 122211 and 10, that added together give a palindrome (122221).

The spelling of 12221110 in words is "twelve million, two hundred twenty-one thousand, one hundred ten".