21414517 has 4 divisors (see below), whose sum is σ = 21604140. Its totient is φ = 21224896.

The previous prime is 21414461. The next prime is 21414529. The reversal of 21414517 is 71541412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 538756 + 20875761 = 734^2 + 4569^2 .

It is a cyclic number.

It is not a de Polignac number, because 21414517 - 2⁷ = 21414389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21414491 and 21414500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21474517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94642 + ... + 94867.

It is an arithmetic number, because the mean of its divisors is an integer number (5401035).

Almost surely, 2^21414517 is an apocalyptic number.

It is an amenable number.

21414517 is a deficient number, since it is larger than the sum of its proper divisors (189623).

21414517 is a wasteful number, since it uses less digits than its factorization.

21414517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189622.

The product of its digits is 1120, while the sum is 25.

The square root of 21414517 is about 4627.5821980814. The cubic root of 21414517 is about 277.6958744782.

Adding to 21414517 its reverse (71541412), we get a palindrome (92955929).

The spelling of 21414517 in words is "twenty-one million, four hundred fourteen thousand, five hundred seventeen".