21414345 has 16 divisors (see below), whose sum is σ = 34845120. Its totient is φ = 11226944.

The previous prime is 21414313. The next prime is 21414361. The reversal of 21414345 is 54341412.

It is a cyclic number.

It is not a de Polignac number, because 21414345 - 2⁵ = 21414313 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11214 + ... + 12983.

It is an arithmetic number, because the mean of its divisors is an integer number (2177820).

Almost surely, 2^21414345 is an apocalyptic number.

It is an amenable number.

21414345 is a deficient number, since it is larger than the sum of its proper divisors (13430775).

21414345 is a wasteful number, since it uses less digits than its factorization.

21414345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24264.

The product of its digits is 1920, while the sum is 24.

The square root of 21414345 is about 4627.5636138253. The cubic root of 21414345 is about 277.6951309979.

Adding to 21414345 its reverse (54341412), we get a palindrome (75755757).

The spelling of 21414345 in words is "twenty-one million, four hundred fourteen thousand, three hundred forty-five".