21706274 has 8 divisors (see below), whose sum is σ = 32677788. Its totient is φ = 10813680.

The previous prime is 21706259. The next prime is 21706313. The reversal of 21706274 is 47260712.

It can be written as a sum of positive squares in 2 ways, for example, as 21669025 + 37249 = 4655^2 + 193^2 .

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, 19037 + ... + 20144.

Almost surely, 2^21706274 is an apocalyptic number.

21706274 is a deficient number, since it is larger than the sum of its proper divisors (10971514).

21706274 is a wasteful number, since it uses less digits than its factorization.

21706274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39460.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 21706274 is about 4658.9992487658. Note that the first 3 decimals coincide. The cubic root of 21706274 is about 278.9513239251.

Adding to 21706274 its reverse (47260712), we get a palindrome (68966986).

The spelling of 21706274 in words is "twenty-one million, seven hundred six thousand, two hundred seventy-four".