21538083 has 8 divisors (see below), whose sum is σ = 32819968. Its totient is φ = 12307464.

The previous prime is 21538067. The next prime is 21538091. The reversal of 21538083 is 38083512.

It is a happy number.

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

It is not a de Polignac number, because 21538083 - 2⁴ = 21538067 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21538083.

It is not an unprimeable number, because it can be changed into a prime (21538003) 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, 512791 + ... + 512832.

It is an arithmetic number, because the mean of its divisors is an integer number (4102496).

Almost surely, 2^21538083 is an apocalyptic number.

21538083 is a deficient number, since it is larger than the sum of its proper divisors (11281885).

21538083 is a wasteful number, since it uses less digits than its factorization.

21538083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025633.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 21538083 is about 4640.9140263530. The cubic root of 21538083 is about 278.2289704789.

The spelling of 21538083 in words is "twenty-one million, five hundred thirty-eight thousand, eighty-three".