21703722 has 16 divisors (see below), whose sum is σ = 43548192. Its totient is φ = 7211120.

The previous prime is 21703711. The next prime is 21703723. The reversal of 21703722 is 22730712.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 21703692 and 21703701.

It is not an unprimeable number, because it can be changed into a prime (21703723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3804 + ... + 7607.

It is an arithmetic number, because the mean of its divisors is an integer number (2721762).

Almost surely, 2^21703722 is an apocalyptic number.

21703722 is the 3804-th pentagonal number.

21703722 is an abundant number, since it is smaller than the sum of its proper divisors (21844470).

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

21703722 is a wasteful number, since it uses less digits than its factorization.

21703722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11733.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 21703722 is about 4658.7253621565. The cubic root of 21703722 is about 278.9403914227.

The spelling of 21703722 in words is "twenty-one million, seven hundred three thousand, seven hundred twenty-two".