21167271 has 16 divisors (see below), whose sum is σ = 31498720. Its totient is φ = 14048640.

The previous prime is 21167257. The next prime is 21167297. The reversal of 21167271 is 17276112.

21167271 is a nontrivial binomial coefficient, being equal to C(6507, 2).

It is not a de Polignac number, because 21167271 - 2⁵ = 21167239 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21167231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4881 + ... + 8133.

It is an arithmetic number, because the mean of its divisors is an integer number (1968670).

Almost surely, 2^21167271 is an apocalyptic number.

21167271 is the 6506-th triangular number.

21167271 is a deficient number, since it is larger than the sum of its proper divisors (10331449).

21167271 is a wasteful number, since it uses less digits than its factorization.

21167271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3503 (or 3497 counting only the distinct ones).

The product of its digits is 1176, while the sum is 27.

The square root of 21167271 is about 4600.7902582056. The cubic root of 21167271 is about 276.6230019314.

The spelling of 21167271 in words is "twenty-one million, one hundred sixty-seven thousand, two hundred seventy-one".