21167265 has 48 divisors (see below), whose sum is σ = 40711680. Its totient is φ = 9354240.

The previous prime is 21167257. The next prime is 21167297. The reversal of 21167265 is 56276112.

It is not a de Polignac number, because 21167265 - 2³ = 21167257 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22321 + ... + 23249.

It is an arithmetic number, because the mean of its divisors is an integer number (848160).

Almost surely, 2^21167265 is an apocalyptic number.

It is an amenable number.

21167265 is a deficient number, since it is larger than the sum of its proper divisors (19544415).

21167265 is a wasteful number, since it uses less digits than its factorization.

21167265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982 (or 975 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 21167265 is about 4600.7896061437. The cubic root of 21167265 is about 276.6229757946.

It can be divided in two parts, 211 and 67265, that added together give a palindrome (67476).

The spelling of 21167265 in words is "twenty-one million, one hundred sixty-seven thousand, two hundred sixty-five".