21412451 has 2 divisors, whose sum is σ = 21412452. Its totient is φ = 21412450.

The previous prime is 21412441. The next prime is 21412493. The reversal of 21412451 is 15421412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21412451 - 2⁶ = 21412387 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21412441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10706225 + 10706226.

It is an arithmetic number, because the mean of its divisors is an integer number (10706226).

Almost surely, 2^21412451 is an apocalyptic number.

21412451 is a deficient number, since it is larger than the sum of its proper divisors (1).

21412451 is an equidigital number, since it uses as much as digits as its factorization.

21412451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 320, while the sum is 20.

The square root of 21412451 is about 4627.3589659762. The cubic root of 21412451 is about 277.6869438055.

Adding to 21412451 its reverse (15421412), we get a palindrome (36833863).

The spelling of 21412451 in words is "twenty-one million, four hundred twelve thousand, four hundred fifty-one".