12220121 has 4 divisors (see below), whose sum is σ = 12237312. Its totient is φ = 12202932.

The previous prime is 12220111. The next prime is 12220129. The reversal of 12220121 is 12102221.

It is a happy number.

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 12220121 - 2¹⁸ = 11957977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12220129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7481 + ... + 8966.

It is an arithmetic number, because the mean of its divisors is an integer number (3059328).

Almost surely, 2^12220121 is an apocalyptic number.

It is an amenable number.

12220121 is a deficient number, since it is larger than the sum of its proper divisors (17191).

12220121 is an equidigital number, since it uses as much as digits as its factorization.

12220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17190.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 12220121 is about 3495.7289654663. The cubic root of 12220121 is about 230.3342399394.

Adding to 12220121 its reverse (12102221), we get a palindrome (24322342).

The spelling of 12220121 in words is "twelve million, two hundred twenty thousand, one hundred twenty-one".