24681421 has 2 divisors, whose sum is σ = 24681422. Its totient is φ = 24681420.

The previous prime is 24681413. The next prime is 24681427. The reversal of 24681421 is 12418642.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18361225 + 6320196 = 4285^2 + 2514^2 .

It is a cyclic number.

It is not a de Polignac number, because 24681421 - 2³ = 24681413 is a prime.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 24681421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24681427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12340710 + 12340711.

It is an arithmetic number, because the mean of its divisors is an integer number (12340711).

Almost surely, 2^24681421 is an apocalyptic number.

It is an amenable number.

24681421 is a deficient number, since it is larger than the sum of its proper divisors (1).

24681421 is an equidigital number, since it uses as much as digits as its factorization.

24681421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 28.

The square root of 24681421 is about 4968.0399555559. The cubic root of 24681421 is about 291.1544194460.

The spelling of 24681421 in words is "twenty-four million, six hundred eighty-one thousand, four hundred twenty-one".