12200121 has 12 divisors (see below), whose sum is σ = 18099172. Its totient is φ = 7913376.

The previous prime is 12200117. The next prime is 12200129. The reversal of 12200121 is 12100221.

12200121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 7952400 + 4247721 = 2820^2 + 2061^2 .

It is not a de Polignac number, because 12200121 - 2² = 12200117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12200129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17986 + ... + 18651.

Almost surely, 2^12200121 is an apocalyptic number.

It is an amenable number.

12200121 is a deficient number, since it is larger than the sum of its proper divisors (5899051).

12200121 is a wasteful number, since it uses less digits than its factorization.

12200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36680 (or 36677 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 12200121 is about 3492.8671603713. The cubic root of 12200121 is about 230.2085128631.

Adding to 12200121 its reverse (12100221), we get a palindrome (24300342).

It can be divided in two parts, 12200 and 121, that added together give a palindrome (12321).

The spelling of 12200121 in words is "twelve million, two hundred thousand, one hundred twenty-one".