21167871 has 8 divisors (see below), whose sum is σ = 28245120. Its totient is φ = 14101272.

The previous prime is 21167863. The next prime is 21167891. The reversal of 21167871 is 17876112.

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

It is not a de Polignac number, because 21167871 - 2³ = 21167863 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 (21167801) 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, 6100 + ... + 8918.

It is an arithmetic number, because the mean of its divisors is an integer number (3530640).

Almost surely, 2^21167871 is an apocalyptic number.

21167871 is a deficient number, since it is larger than the sum of its proper divisors (7077249).

21167871 is a wasteful number, since it uses less digits than its factorization.

21167871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5325.

The product of its digits is 4704, while the sum is 33.

The square root of 21167871 is about 4600.8554639328. The cubic root of 21167871 is about 276.6256155928.

The spelling of 21167871 in words is "twenty-one million, one hundred sixty-seven thousand, eight hundred seventy-one".