21548413 has 8 divisors (see below), whose sum is σ = 22939200. Its totient is φ = 20183328.

The previous prime is 21548399. The next prime is 21548491. The reversal of 21548413 is 31484512.

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

It is a cyclic number.

It is not a de Polignac number, because 21548413 - 2⁵ = 21548381 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 (21548113) 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, 4681 + ... + 8062.

It is an arithmetic number, because the mean of its divisors is an integer number (2867400).

Almost surely, 2^21548413 is an apocalyptic number.

It is an amenable number.

21548413 is a deficient number, since it is larger than the sum of its proper divisors (1390787).

21548413 is a wasteful number, since it uses less digits than its factorization.

21548413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12851.

The product of its digits is 3840, while the sum is 28.

The square root of 21548413 is about 4642.0268202586. The cubic root of 21548413 is about 278.2734443518.

The spelling of 21548413 in words is "twenty-one million, five hundred forty-eight thousand, four hundred thirteen".