21449683 has 8 divisors (see below), whose sum is σ = 22389696. Its totient is φ = 20529600.

The previous prime is 21449671. The next prime is 21449693. The reversal of 21449683 is 38694412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21449683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21449633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2763 + ... + 7108.

It is an arithmetic number, because the mean of its divisors is an integer number (2798712).

Almost surely, 2^21449683 is an apocalyptic number.

21449683 is a deficient number, since it is larger than the sum of its proper divisors (940013).

21449683 is an equidigital number, since it uses as much as digits as its factorization.

21449683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9965.

The product of its digits is 41472, while the sum is 37.

The square root of 21449683 is about 4631.3802478311. The cubic root of 21449683 is about 277.8477980935.

The spelling of 21449683 in words is "twenty-one million, four hundred forty-nine thousand, six hundred eighty-three".