12421987 has 2 divisors, whose sum is σ = 12421988. Its totient is φ = 12421986.

The previous prime is 12421949. The next prime is 12422009. The reversal of 12421987 is 78912421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12421987 - 2⁷ = 12421859 is a prime.

It is a super-2 number, since 2×12421987² = 308611522056338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12421187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210993 + 6210994.

It is an arithmetic number, because the mean of its divisors is an integer number (6210994).

Almost surely, 2^12421987 is an apocalyptic number.

12421987 is a deficient number, since it is larger than the sum of its proper divisors (1).

12421987 is an equidigital number, since it uses as much as digits as its factorization.

12421987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 34.

The square root of 12421987 is about 3524.4839338547. The cubic root of 12421987 is about 231.5956280875.

The spelling of 12421987 in words is "twelve million, four hundred twenty-one thousand, nine hundred eighty-seven".