21167273 has 8 divisors (see below), whose sum is σ = 22480800. Its totient is φ = 19873728.

The previous prime is 21167257. The next prime is 21167297. The reversal of 21167273 is 37276112.

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

It is a cyclic number.

It is not a de Polignac number, because 21167273 - 2⁴ = 21167257 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21167213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2783 + ... + 7076.

It is an arithmetic number, because the mean of its divisors is an integer number (2810100).

Almost surely, 2^21167273 is an apocalyptic number.

It is an amenable number.

21167273 is a deficient number, since it is larger than the sum of its proper divisors (1313527).

21167273 is a wasteful number, since it uses less digits than its factorization.

21167273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9991.

The product of its digits is 3528, while the sum is 29.

The square root of 21167273 is about 4600.7904755596. The cubic root of 21167273 is about 276.6230106437.

The spelling of 21167273 in words is "twenty-one million, one hundred sixty-seven thousand, two hundred seventy-three".