12121201 has 4 divisors (see below), whose sum is σ = 12139632. Its totient is φ = 12102772.

The previous prime is 12121157. The next prime is 12121211. The reversal of 12121201 is 10212121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12121201 - 2¹⁷ = 11990129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8191 + ... + 9556.

It is an arithmetic number, because the mean of its divisors is an integer number (3034908).

Almost surely, 2^12121201 is an apocalyptic number.

It is an amenable number.

12121201 is a deficient number, since it is larger than the sum of its proper divisors (18431).

12121201 is an equidigital number, since it uses as much as digits as its factorization.

12121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18430.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 12121201 is about 3481.5515219511. The cubic root of 12121201 is about 229.7110486076.

Adding to 12121201 its reverse (10212121), we get a palindrome (22333322).

It can be divided in two parts, 1212120 and 1, that added together give a palindrome (1212121).

The spelling of 12121201 in words is "twelve million, one hundred twenty-one thousand, two hundred one".