21488678 has 8 divisors (see below), whose sum is σ = 32356368. Its totient is φ = 10703224.

The previous prime is 21488671. The next prime is 21488683. The reversal of 21488678 is 87688412.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21488671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19901 + ... + 20952.

It is an arithmetic number, because the mean of its divisors is an integer number (4044546).

Almost surely, 2^21488678 is an apocalyptic number.

21488678 is a deficient number, since it is larger than the sum of its proper divisors (10867690).

21488678 is a wasteful number, since it uses less digits than its factorization.

21488678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41118.

The product of its digits is 172032, while the sum is 44.

The square root of 21488678 is about 4635.5882043167. The cubic root of 21488678 is about 278.0160696678.

The spelling of 21488678 in words is "twenty-one million, four hundred eighty-eight thousand, six hundred seventy-eight".