21470766 has 8 divisors (see below), whose sum is σ = 42941544. Its totient is φ = 7156920.

The previous prime is 21470737. The next prime is 21470783. The reversal of 21470766 is 66707412.

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

21470766 is an admirable number.

It is a Curzon number.

It is a congruent number.

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, 1789225 + ... + 1789236.

It is an arithmetic number, because the mean of its divisors is an integer number (5367693).

Almost surely, 2^21470766 is an apocalyptic number.

21470766 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21470766 is a wasteful number, since it uses less digits than its factorization.

21470766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3578466.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 21470766 is about 4633.6557921365. The cubic root of 21470766 is about 277.9388009447.

The spelling of 21470766 in words is "twenty-one million, four hundred seventy thousand, seven hundred sixty-six".