12211722 has 24 divisors (see below), whose sum is σ = 27439776. Its totient is φ = 4070412.

The previous prime is 12211721. The next prime is 12211723. The reversal of 12211722 is 22711221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12211721) and next prime (12211723).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 12211695 and 12211704.

It is not an unprimeable number, because it can be changed into a prime (12211721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12078 + ... + 13049.

It is an arithmetic number, because the mean of its divisors is an integer number (1143324).

Almost surely, 2^12211722 is an apocalyptic number.

12211722 is an abundant number, since it is smaller than the sum of its proper divisors (15228054).

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

12211722 is an equidigital number, since it uses as much as digits as its factorization.

12211722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25144 (or 25132 counting only the distinct ones).

The product of its digits is 112, while the sum is 18.

The square root of 12211722 is about 3494.5274358631. The cubic root of 12211722 is about 230.2814575742.

Adding to 12211722 its reverse (22711221), we get a palindrome (34922943).

The spelling of 12211722 in words is "twelve million, two hundred eleven thousand, seven hundred twenty-two".