21466671 has 8 divisors (see below), whose sum is σ = 28645680. Its totient is φ = 14299392.

The previous prime is 21466651. The next prime is 21466673. The reversal of 21466671 is 17666412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21466671 - 2⁶ = 21466607 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21466673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3135 + ... + 7263.

It is an arithmetic number, because the mean of its divisors is an integer number (3580710).

Almost surely, 2^21466671 is an apocalyptic number.

21466671 is a deficient number, since it is larger than the sum of its proper divisors (7179009).

21466671 is a wasteful number, since it uses less digits than its factorization.

21466671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5865.

The product of its digits is 12096, while the sum is 33.

The square root of 21466671 is about 4633.2138953431. The cubic root of 21466671 is about 277.9211299131.

The spelling of 21466671 in words is "twenty-one million, four hundred sixty-six thousand, six hundred seventy-one".