21494733 has 16 divisors (see below), whose sum is σ = 31449600. Its totient is φ = 12976704.

The previous prime is 21494729. The next prime is 21494779. The reversal of 21494733 is 33749412.

It is not a de Polignac number, because 21494733 - 2² = 21494729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21494694 and 21494703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21494723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3133 + ... + 7266.

It is an arithmetic number, because the mean of its divisors is an integer number (1965600).

Almost surely, 2^21494733 is an apocalyptic number.

It is an amenable number.

21494733 is a deficient number, since it is larger than the sum of its proper divisors (9954867).

21494733 is a wasteful number, since it uses less digits than its factorization.

21494733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10468.

The product of its digits is 18144, while the sum is 33.

The square root of 21494733 is about 4636.2412577432. The cubic root of 21494733 is about 278.0421799946.

The spelling of 21494733 in words is "twenty-one million, four hundred ninety-four thousand, seven hundred thirty-three".