12421982 has 4 divisors (see below), whose sum is σ = 18632976. Its totient is φ = 6210990.

The previous prime is 12421949. The next prime is 12421987. The reversal of 12421982 is 28912421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28912421 = 41 ⋅705181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12421987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3105494 + ... + 3105497.

It is an arithmetic number, because the mean of its divisors is an integer number (4658244).

Almost surely, 2^12421982 is an apocalyptic number.

12421982 is a deficient number, since it is larger than the sum of its proper divisors (6210994).

12421982 is an equidigital number, since it uses as much as digits as its factorization.

12421982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6210993.

The product of its digits is 2304, while the sum is 29.

The square root of 12421982 is about 3524.4832245309. The cubic root of 12421982 is about 231.5955970141.

The spelling of 12421982 in words is "twelve million, four hundred twenty-one thousand, nine hundred eighty-two".