12211138 has 4 divisors (see below), whose sum is σ = 18316710. Its totient is φ = 6105568.

The previous prime is 12211127. The next prime is 12211139. The reversal of 12211138 is 83111221.

12211138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83111221 = 1049 ⋅79229.

It can be written as a sum of positive squares in only one way, i.e., 11716929 + 494209 = 3423^2 + 703^2 .

It is a super-2 number, since 2×12211138² = 298223782510088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12211139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3052783 + ... + 3052786.

Almost surely, 2^12211138 is an apocalyptic number.

12211138 is a deficient number, since it is larger than the sum of its proper divisors (6105572).

12211138 is an equidigital number, since it uses as much as digits as its factorization.

12211138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6105571.

The product of its digits is 96, while the sum is 19.

The square root of 12211138 is about 3494.4438756403. The cubic root of 12211138 is about 230.2777866064.

Adding to 12211138 its reverse (83111221), we get a palindrome (95322359).

The spelling of 12211138 in words is "twelve million, two hundred eleven thousand, one hundred thirty-eight".