21167243 has 8 divisors (see below), whose sum is σ = 21711312. Its totient is φ = 20630016.

The previous prime is 21167239. The next prime is 21167257. The reversal of 21167243 is 34276112.

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 21167243 - 2² = 21167239 is a prime.

It is a Duffinian 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, 4871 + ... + 8127.

It is an arithmetic number, because the mean of its divisors is an integer number (2713914).

Almost surely, 2^21167243 is an apocalyptic number.

21167243 is a deficient number, since it is larger than the sum of its proper divisors (544069).

21167243 is an equidigital number, since it uses as much as digits as its factorization.

21167243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3421.

The product of its digits is 2016, while the sum is 26.

The square root of 21167243 is about 4600.7872152491. The cubic root of 21167243 is about 276.6228799594.

The spelling of 21167243 in words is "twenty-one million, one hundred sixty-seven thousand, two hundred forty-three".