21049693 has 8 divisors (see below), whose sum is σ = 24120000. Its totient is φ = 17995200.

The previous prime is 21049681. The next prime is 21049703. The reversal of 21049693 is 39694012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21049693 - 2¹⁷ = 20918621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21049643) 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, 943 + ... + 6556.

It is an arithmetic number, because the mean of its divisors is an integer number (3015000).

Almost surely, 2^21049693 is an apocalyptic number.

It is an amenable number.

21049693 is a deficient number, since it is larger than the sum of its proper divisors (3070307).

21049693 is an equidigital number, since it uses as much as digits as its factorization.

21049693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7907.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 21049693 is about 4587.9944420193. The cubic root of 21049693 is about 276.1098640194.

The spelling of 21049693 in words is "twenty-one million, forty-nine thousand, six hundred ninety-three".