21459538 has 8 divisors (see below), whose sum is σ = 32229360. Its totient is φ = 10716420.

The previous prime is 21459527. The next prime is 21459547. The reversal of 21459538 is 83595412.

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

It is a junction number, because it is equal to n+sod(n) for n = 21459497 and 21459506.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4528 + ... + 7963.

It is an arithmetic number, because the mean of its divisors is an integer number (4028670).

Almost surely, 2^21459538 is an apocalyptic number.

21459538 is a deficient number, since it is larger than the sum of its proper divisors (10769822).

21459538 is a wasteful number, since it uses less digits than its factorization.

21459538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13352.

The product of its digits is 43200, while the sum is 37.

The square root of 21459538 is about 4632.4440633428. Note that the first 3 decimals coincide. The cubic root of 21459538 is about 277.8903437231.

The spelling of 21459538 in words is "twenty-one million, four hundred fifty-nine thousand, five hundred thirty-eight".