12211155 has 40 divisors (see below), whose sum is σ = 23888304. Its totient is φ = 5918400.

The previous prime is 12211141. The next prime is 12211159. The reversal of 12211155 is 55111221.

12211155 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12211155 - 2⁴ = 12211139 is a prime.

It is a super-2 number, since 2×12211155² = 298224612868050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12211159) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3085 + ... + 5825.

Almost surely, 2^12211155 is an apocalyptic number.

12211155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12211155 is a deficient number, since it is larger than the sum of its proper divisors (11677149).

12211155 is a wasteful number, since it uses less digits than its factorization.

12211155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2769 (or 2760 counting only the distinct ones).

The product of its digits is 100, while the sum is 18.

The square root of 12211155 is about 3494.4463080723. The cubic root of 12211155 is about 230.2778934684.

Adding to 12211155 its reverse (55111221), we get a palindrome (67322376).

The spelling of 12211155 in words is "twelve million, two hundred eleven thousand, one hundred fifty-five".