21766106 has 16 divisors (see below), whose sum is σ = 33176520. Its totient is φ = 10708800.

The previous prime is 21766099. The next prime is 21766139. The reversal of 21766106 is 60166712.

It can be written as a sum of positive squares in 4 ways, for example, as 18190225 + 3575881 = 4265^2 + 1891^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55760 + ... + 56148.

Almost surely, 2^21766106 is an apocalyptic number.

21766106 is a deficient number, since it is larger than the sum of its proper divisors (11410414).

21766106 is a wasteful number, since it uses less digits than its factorization.

21766106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 21766106 is about 4665.4159514453. The cubic root of 21766106 is about 279.2073928059.

The spelling of 21766106 in words is "twenty-one million, seven hundred sixty-six thousand, one hundred six".