21548879 has 8 divisors (see below), whose sum is σ = 23587200. Its totient is φ = 19523800.

The previous prime is 21548873. The next prime is 21548881. The reversal of 21548879 is 97884512.

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-21548879 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 (21548873) 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, 272 + ... + 6570.

It is an arithmetic number, because the mean of its divisors is an integer number (2948400).

Almost surely, 2^21548879 is an apocalyptic number.

21548879 is a deficient number, since it is larger than the sum of its proper divisors (2038321).

21548879 is a wasteful number, since it uses less digits than its factorization.

21548879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6621.

The product of its digits is 161280, while the sum is 44.

The square root of 21548879 is about 4642.0770135792. The cubic root of 21548879 is about 278.2754502921.

It can be divided in two parts, 215 and 48879, that added together give a palindrome (49094).

The spelling of 21548879 in words is "twenty-one million, five hundred forty-eight thousand, eight hundred seventy-nine".