11721222 has 12 divisors (see below), whose sum is σ = 25396020. Its totient is φ = 3907068.

The previous prime is 11721221. The next prime is 11721223. The reversal of 11721222 is 22212711.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11721221) and next prime (11721223).

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 651179 = 11721222 / (1 + 1 + 7 + 2 + 1 + 2 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 11721195 and 11721204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11721221) 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 5 ways as a sum of consecutive naturals, for example, 325572 + ... + 325607.

It is an arithmetic number, because the mean of its divisors is an integer number (2116335).

Almost surely, 2^11721222 is an apocalyptic number.

11721222 is an abundant number, since it is smaller than the sum of its proper divisors (13674798).

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

11721222 is a wasteful number, since it uses less digits than its factorization.

11721222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651187 (or 651184 counting only the distinct ones).

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

The square root of 11721222 is about 3423.6270240784. The cubic root of 11721222 is about 227.1560442597.

Adding to 11721222 its reverse (22212711), we get a palindrome (33933933).

It can be divided in two parts, 11721 and 222, that multiplied together give a palindrome (2602062).

The spelling of 11721222 in words is "eleven million, seven hundred twenty-one thousand, two hundred twenty-two".