21488001 has 4 divisors (see below), whose sum is σ = 28650672. Its totient is φ = 14325332.

The previous prime is 21487981. The next prime is 21488011. The reversal of 21488001 is 10088412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21488001 - 2¹⁰ = 21486977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21488011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3581331 + ... + 3581336.

It is an arithmetic number, because the mean of its divisors is an integer number (7162668).

Almost surely, 2^21488001 is an apocalyptic number.

It is an amenable number.

21488001 is a deficient number, since it is larger than the sum of its proper divisors (7162671).

21488001 is an equidigital number, since it uses as much as digits as its factorization.

21488001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7162670.

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 21488001 is about 4635.5151817247. The cubic root of 21488001 is about 278.0131500085.

The spelling of 21488001 in words is "twenty-one million, four hundred eighty-eight thousand, one".