21167266 has 8 divisors (see below), whose sum is σ = 32489424. Its totient is φ = 10337460.

The previous prime is 21167257. The next prime is 21167297. The reversal of 21167266 is 66276112.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122980 + ... + 123151.

It is an arithmetic number, because the mean of its divisors is an integer number (4061178).

Almost surely, 2^21167266 is an apocalyptic number.

21167266 is a deficient number, since it is larger than the sum of its proper divisors (11322158).

21167266 is a wasteful number, since it uses less digits than its factorization.

21167266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246176.

The product of its digits is 6048, while the sum is 31.

The square root of 21167266 is about 4600.7897148207. The cubic root of 21167266 is about 276.6229801507.

The spelling of 21167266 in words is "twenty-one million, one hundred sixty-seven thousand, two hundred sixty-six".