21703734 has 64 divisors (see below), whose sum is σ = 53222400. Its totient is φ = 6513696.

The previous prime is 21703729. The next prime is 21703769. The reversal of 21703734 is 43730712.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21703698 and 21703707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29827 + ... + 30545.

It is an arithmetic number, because the mean of its divisors is an integer number (831600).

Almost surely, 2^21703734 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21703734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26611200).

21703734 is an abundant number, since it is smaller than the sum of its proper divisors (31518666).

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

21703734 is a wasteful number, since it uses less digits than its factorization.

21703734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786 (or 780 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 21703734 is about 4658.7266500622. The cubic root of 21703734 is about 278.9404428314.

The spelling of 21703734 in words is "twenty-one million, seven hundred three thousand, seven hundred thirty-four".