21548093 has 12 divisors (see below), whose sum is σ = 25234812. Its totient is φ = 18345600.

The previous prime is 21548089. The next prime is 21548113. The reversal of 21548093 is 39084512.

It can be written as a sum of positive squares in 2 ways, for example, as 8602489 + 12945604 = 2933^2 + 3598^2 .

It is not a de Polignac number, because 21548093 - 2² = 21548089 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 (21548063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6293 + ... + 9093.

It is an arithmetic number, because the mean of its divisors is an integer number (2102901).

Almost surely, 2^21548093 is an apocalyptic number.

It is an amenable number.

21548093 is a deficient number, since it is larger than the sum of its proper divisors (3686719).

21548093 is a wasteful number, since it uses less digits than its factorization.

21548093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2972 (or 2965 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 21548093 is about 4641.9923524280. The cubic root of 21548093 is about 278.2720668654.

The spelling of 21548093 in words is "twenty-one million, five hundred forty-eight thousand, ninety-three".