21675266 has 8 divisors (see below), whose sum is σ = 33391740. Its totient is φ = 10544688.

The previous prime is 21675239. The next prime is 21675281. The reversal of 21675266 is 66257612.

It can be written as a sum of positive squares in 2 ways, for example, as 21669025 + 6241 = 4655^2 + 79^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146381 + ... + 146528.

Almost surely, 2^21675266 is an apocalyptic number.

21675266 is a deficient number, since it is larger than the sum of its proper divisors (11716474).

21675266 is a wasteful number, since it uses less digits than its factorization.

21675266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292948.

The product of its digits is 30240, while the sum is 35.

The square root of 21675266 is about 4655.6703061965. The cubic root of 21675266 is about 278.8184307854.

The spelling of 21675266 in words is "twenty-one million, six hundred seventy-five thousand, two hundred sixty-six".