21707734 has 8 divisors (see below), whose sum is σ = 32644008. Its totient is φ = 10826400.

The previous prime is 21707717. The next prime is 21707743. The reversal of 21707734 is 43770712.

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

It is a junction number, because it is equal to n+sod(n) for n = 21707696 and 21707705.

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, 12732 + ... + 14335.

It is an arithmetic number, because the mean of its divisors is an integer number (4080501).

Almost surely, 2^21707734 is an apocalyptic number.

21707734 is a deficient number, since it is larger than the sum of its proper divisors (10936274).

21707734 is a wasteful number, since it uses less digits than its factorization.

21707734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27470.

The product of its (nonzero) digits is 8232, while the sum is 31.

The square root of 21707734 is about 4659.1559321405. The cubic root of 21707734 is about 278.9575780278.

The spelling of 21707734 in words is "twenty-one million, seven hundred seven thousand, seven hundred thirty-four".