12212144 has 20 divisors (see below), whose sum is σ = 27041424.
Its totient is φ = 5233728.
The previous prime is 12212143. The next prime is 12212147. The reversal of 12212144 is 44121221.
It is a super-2 number, since 2×122121442 = 298272922153472, which contains 22 as substring.
It is a nude number because it is divisible by every one of its digits.
It is not an unprimeable number, because it can be changed into a prime (12212141) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54407 + ... + 54630.
Almost surely, 212212144 is an apocalyptic number.
12212144 is a gapful number since it is divisible by the number (14) formed by its first and last digit.
It is an amenable number.
12212144 is an abundant number, since it is smaller than the sum of its proper divisors (14829280).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
12212144 is a wasteful number, since it uses less digits than its factorization.
12212144 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 109052 (or 109046 counting only the distinct ones).
The product of its digits is 128, while the sum is 17.
The square root of 12212144 is about 3494.5878154655.
The cubic root of 12212144 is about 230.2841101528.
Adding to 12212144 its reverse (44121221), we get a palindrome (56333365).
The spelling of 12212144 in words is "twelve million, two hundred twelve thousand, one hundred forty-four".