12201138 has 32 divisors (see below), whose sum is σ = 28710720. Its totient is φ = 3827520.

The previous prime is 12201131. The next prime is 12201139. The reversal of 12201138 is 83110221.

12201138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 12201138.

It is not an unprimeable number, because it can be changed into a prime (12201131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5728 + ... + 7563.

It is an arithmetic number, because the mean of its divisors is an integer number (897210).

Almost surely, 2^12201138 is an apocalyptic number.

12201138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12201138 is an abundant number, since it is smaller than the sum of its proper divisors (16509582).

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

12201138 is a wasteful number, since it uses less digits than its factorization.

12201138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13319 (or 13313 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 12201138 is about 3493.0127397420. The cubic root of 12201138 is about 230.2149093995.

Adding to 12201138 its reverse (83110221), we get a palindrome (95311359).

The spelling of 12201138 in words is "twelve million, two hundred one thousand, one hundred thirty-eight".