21743522 has 8 divisors (see below), whose sum is σ = 32647836. Its totient is φ = 10860912.

The previous prime is 21743521. The next prime is 21743551. The reversal of 21743522 is 22534712.

It can be written as a sum of positive squares in 2 ways, for example, as 21613201 + 130321 = 4649^2 + 361^2 .

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 = 21743491 and 21743500.

It is not an unprimeable number, because it can be changed into a prime (21743521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2633 + ... + 7100.

Almost surely, 2^21743522 is an apocalyptic number.

21743522 is a deficient number, since it is larger than the sum of its proper divisors (10904314).

21743522 is a wasteful number, since it uses less digits than its factorization.

21743522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10852.

The product of its digits is 3360, while the sum is 26.

The square root of 21743522 is about 4662.9949603232. The cubic root of 21743522 is about 279.1107930456.

The spelling of 21743522 in words is "twenty-one million, seven hundred forty-three thousand, five hundred twenty-two".