21488163 has 8 divisors (see below), whose sum is σ = 28728000. Its totient is φ = 14286888.

The previous prime is 21488143. The next prime is 21488171. The reversal of 21488163 is 36188412.

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

It is not a de Polignac number, because 21488163 - 2⁶ = 21488099 is a prime.

It is a super-2 number, since 2×21488163² = 923482298229138, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21488113) 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, 8313 + ... + 10586.

It is an arithmetic number, because the mean of its divisors is an integer number (3591000).

Almost surely, 2^21488163 is an apocalyptic number.

21488163 is a deficient number, since it is larger than the sum of its proper divisors (7239837).

21488163 is a wasteful number, since it uses less digits than its factorization.

21488163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19281.

The product of its digits is 9216, while the sum is 33.

The square root of 21488163 is about 4635.5326554777. The cubic root of 21488163 is about 278.0138486623.

The spelling of 21488163 in words is "twenty-one million, four hundred eighty-eight thousand, one hundred sixty-three".