12421111 has 4 divisors (see below), whose sum is σ = 12821824. Its totient is φ = 12020400.

The previous prime is 12421103. The next prime is 12421121. The reversal of 12421111 is 11112421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12421111 - 2³ = 12421103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12421091 and 12421100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12421121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200310 + ... + 200371.

It is an arithmetic number, because the mean of its divisors is an integer number (3205456).

Almost surely, 2^12421111 is an apocalyptic number.

12421111 is a deficient number, since it is larger than the sum of its proper divisors (400713).

12421111 is an equidigital number, since it uses as much as digits as its factorization.

12421111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400712.

The product of its digits is 16, while the sum is 13.

The square root of 12421111 is about 3524.3596581507. The cubic root of 12421111 is about 231.5901839091.

Adding to 12421111 its reverse (11112421), we get a palindrome (23533532).

It can be divided in two parts, 12421 and 111, that multiplied together give a palindrome (1378731).

The spelling of 12421111 in words is "twelve million, four hundred twenty-one thousand, one hundred eleven".