21434719 has 2 divisors, whose sum is σ = 21434720. Its totient is φ = 21434718.

The previous prime is 21434681. The next prime is 21434723. The reversal of 21434719 is 91743412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21434719 - 2⁷ = 21434591 is a prime.

It is a super-2 number, since 2×21434719² = 918894357217922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21434779) 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, 10717359 + 10717360.

It is an arithmetic number, because the mean of its divisors is an integer number (10717360).

Almost surely, 2^21434719 is an apocalyptic number.

21434719 is a deficient number, since it is larger than the sum of its proper divisors (1).

21434719 is an equidigital number, since it uses as much as digits as its factorization.

21434719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 31.

The square root of 21434719 is about 4629.7644648513. The cubic root of 21434719 is about 277.7831711605.

The spelling of 21434719 in words is "twenty-one million, four hundred thirty-four thousand, seven hundred nineteen".