21442706 has 8 divisors (see below), whose sum is σ = 32187324. Its totient is φ = 10713600.

The previous prime is 21442703. The next prime is 21442717. The reversal of 21442706 is 60724412.

It can be written as a sum of positive squares in 2 ways, for example, as 15484225 + 5958481 = 3935^2 + 2441^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21442703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626 + ... + 6578.

Almost surely, 2^21442706 is an apocalyptic number.

21442706 is a deficient number, since it is larger than the sum of its proper divisors (10744618).

21442706 is a wasteful number, since it uses less digits than its factorization.

21442706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7756.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 21442706 is about 4630.6269553917. The cubic root of 21442706 is about 277.8176693761.

The spelling of 21442706 in words is "twenty-one million, four hundred forty-two thousand, seven hundred six".