12212818 has 16 divisors (see below), whose sum is σ = 18627840. Its totient is φ = 6004656.

The previous prime is 12212797. The next prime is 12212831. The reversal of 12212818 is 81821221.

12212818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12212818² = 298305847002248, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12212792 and 12212801.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54655 + ... + 54877.

It is an arithmetic number, because the mean of its divisors is an integer number (1164240).

Almost surely, 2^12212818 is an apocalyptic number.

12212818 is a deficient number, since it is larger than the sum of its proper divisors (6415022).

12212818 is a wasteful number, since it uses less digits than its factorization.

12212818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561.

The product of its digits is 512, while the sum is 25.

The square root of 12212818 is about 3494.6842489701. The cubic root of 12212818 is about 230.2883466089.

It can be divided in two parts, 122 and 12818, that multiplied together give a triangular number (1563796 = T₁₇₆₈).

The spelling of 12212818 in words is "twelve million, two hundred twelve thousand, eight hundred eighteen".