21703534 has 16 divisors (see below), whose sum is σ = 34517376. Its totient is φ = 10216800.

The previous prime is 21703501. The next prime is 21703541. The reversal of 21703534 is 43530712.

It is a junction number, because it is equal to n+sod(n) for n = 21703499 and 21703508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2437 + ... + 7024.

It is an arithmetic number, because the mean of its divisors is an integer number (2157336).

Almost surely, 2^21703534 is an apocalyptic number.

21703534 is a deficient number, since it is larger than the sum of its proper divisors (12813842).

21703534 is a wasteful number, since it uses less digits than its factorization.

21703534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9531.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 21703534 is about 4658.7051849199. The cubic root of 21703534 is about 278.9395860164.

The spelling of 21703534 in words is "twenty-one million, seven hundred three thousand, five hundred thirty-four".