21488783 has 8 divisors (see below), whose sum is σ = 21999600. Its totient is φ = 20984128.

The previous prime is 21488759. The next prime is 21488801. The reversal of 21488783 is 38788412.

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 21488783 - 2²⁰ = 20440207 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21488783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21488713) 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, 5933 + ... + 8841.

It is an arithmetic number, because the mean of its divisors is an integer number (2749950).

Almost surely, 2^21488783 is an apocalyptic number.

21488783 is a deficient number, since it is larger than the sum of its proper divisors (510817).

21488783 is an equidigital number, since it uses as much as digits as its factorization.

21488783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3081.

The product of its digits is 86016, while the sum is 41.

The square root of 21488783 is about 4635.5995297264. The cubic root of 21488783 is about 278.0165224899.

The spelling of 21488783 in words is "twenty-one million, four hundred eighty-eight thousand, seven hundred eighty-three".