12221111 has 8 divisors (see below), whose sum is σ = 14230944. Its totient is φ = 10277280.

The previous prime is 12221107. The next prime is 12221117. The reversal of 12221111 is 11112221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12221111 - 2² = 12221107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12221092 and 12221101.

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 7 ways as a sum of consecutive naturals, for example, 16100 + ... + 16841.

It is an arithmetic number, because the mean of its divisors is an integer number (1778868).

Almost surely, 2^12221111 is an apocalyptic number.

12221111 is a deficient number, since it is larger than the sum of its proper divisors (2009833).

12221111 is an equidigital number, since it uses as much as digits as its factorization.

12221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33001.

The product of its digits is 8, while the sum is 11.

The square root of 12221111 is about 3495.8705639654. The cubic root of 12221111 is about 230.3404598653.

Adding to 12221111 its reverse (11112221), we get a palindrome (23333332).

It can be divided in two parts, 12221 and 111, that multiplied together give a palindrome (1356531).

The spelling of 12221111 in words is "twelve million, two hundred twenty-one thousand, one hundred eleven".