21867017 has 4 divisors (see below), whose sum is σ = 21981696. Its totient is φ = 21752340.

The previous prime is 21866989. The next prime is 21867019. The reversal of 21867017 is 71076812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21867017 - 2¹⁰ = 21865993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21867019) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 57053 + ... + 57434.

It is an arithmetic number, because the mean of its divisors is an integer number (5495424).

Almost surely, 2^21867017 is an apocalyptic number.

It is an amenable number.

21867017 is a deficient number, since it is larger than the sum of its proper divisors (114679).

21867017 is a wasteful number, since it uses less digits than its factorization.

21867017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114678.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 21867017 is about 4676.2182369945. The cubic root of 21867017 is about 279.6382104522.

The spelling of 21867017 in words is "twenty-one million, eight hundred sixty-seven thousand, seventeen".