21706734 has 32 divisors (see below), whose sum is σ = 49833216. Its totient is φ = 6174720.

The previous prime is 21706717. The next prime is 21706777. The reversal of 21706734 is 43760712.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9789 + ... + 11799.

It is an arithmetic number, because the mean of its divisors is an integer number (1557288).

Almost surely, 2^21706734 is an apocalyptic number.

21706734 is an abundant number, since it is smaller than the sum of its proper divisors (28126482).

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

21706734 is a wasteful number, since it uses less digits than its factorization.

21706734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 21706734 is about 4659.0486153291. The cubic root of 21706734 is about 278.9532944261.

The spelling of 21706734 in words is "twenty-one million, seven hundred six thousand, seven hundred thirty-four".