12420121 has 4 divisors (see below), whose sum is σ = 14194432. Its totient is φ = 10645812.

The previous prime is 12420097. The next prime is 12420131. The reversal of 12420121 is 12102421.

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 a de Polignac number, because none of the positive numbers 2^k-12420121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12420131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 887145 + ... + 887158.

It is an arithmetic number, because the mean of its divisors is an integer number (3548608).

Almost surely, 2^12420121 is an apocalyptic number.

It is an amenable number.

12420121 is a deficient number, since it is larger than the sum of its proper divisors (1774311).

12420121 is an equidigital number, since it uses as much as digits as its factorization.

12420121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774310.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 12420121 is about 3524.2192043061. The cubic root of 12420121 is about 231.5840309336.

Adding to 12420121 its reverse (12102421), we get a palindrome (24522542).

The spelling of 12420121 in words is "twelve million, four hundred twenty thousand, one hundred twenty-one".