21755066 has 8 divisors (see below), whose sum is σ = 32652660. Its totient is φ = 10870848.

The previous prime is 21755021. The next prime is 21755077. The reversal of 21755066 is 66055712.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20511841 + 1243225 = 4529^2 + 1115^2 .

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, 3650 + ... + 7538.

Almost surely, 2^21755066 is an apocalyptic number.

21755066 is a deficient number, since it is larger than the sum of its proper divisors (10897594).

21755066 is a wasteful number, since it uses less digits than its factorization.

21755066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6688.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 21755066 is about 4664.2326271317. The cubic root of 21755066 is about 279.1601791715.

The spelling of 21755066 in words is "twenty-one million, seven hundred fifty-five thousand, sixty-six".