21444706 has 4 divisors (see below), whose sum is σ = 32167062. Its totient is φ = 10722352.

The previous prime is 21444697. The next prime is 21444713. The reversal of 21444706 is 60744412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19316025 + 2128681 = 4395^2 + 1459^2 .

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 as a sum of consecutive naturals, namely, 5361175 + ... + 5361178.

Almost surely, 2^21444706 is an apocalyptic number.

21444706 is a deficient number, since it is larger than the sum of its proper divisors (10722356).

21444706 is a wasteful number, since it uses less digits than its factorization.

21444706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10722355.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 21444706 is about 4630.8429038351. The cubic root of 21444706 is about 277.8263066265.

The spelling of 21444706 in words is "twenty-one million, four hundred forty-four thousand, seven hundred six".