21485383 has 4 divisors (see below), whose sum is σ = 21575520. Its totient is φ = 21395248.

The previous prime is 21485357. The next prime is 21485413. The reversal of 21485383 is 38358412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21485383 - 2⁵ = 21485351 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 (21485083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44710 + ... + 45187.

It is an arithmetic number, because the mean of its divisors is an integer number (5393880).

Almost surely, 2^21485383 is an apocalyptic number.

21485383 is a deficient number, since it is larger than the sum of its proper divisors (90137).

21485383 is an equidigital number, since it uses as much as digits as its factorization.

21485383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90136.

The product of its digits is 23040, while the sum is 34.

The square root of 21485383 is about 4635.2327881132. The cubic root of 21485383 is about 278.0018589321.

The spelling of 21485383 in words is "twenty-one million, four hundred eighty-five thousand, three hundred eighty-three".