21252003 has 8 divisors (see below), whose sum is σ = 28367616. Its totient is φ = 14152200.

The previous prime is 21252001. The next prime is 21252017. The reversal of 21252003 is 30025212.

21252003 is an esthetic number in base 7, because in such base its adjacent digits differ by 1.

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

It is not a de Polignac number, because 21252003 - 2¹ = 21252001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21252001) 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 7 ways as a sum of consecutive naturals, for example, 343 + ... + 6528.

It is an arithmetic number, because the mean of its divisors is an integer number (3545952).

Almost surely, 2^21252003 is an apocalyptic number.

21252003 is a deficient number, since it is larger than the sum of its proper divisors (7115613).

21252003 is a wasteful number, since it uses less digits than its factorization.

21252003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7905.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 21252003 is about 4609.9894793806. The cubic root of 21252003 is about 276.9916152588.

Adding to 21252003 its reverse (30025212), we get a palindrome (51277215).

The spelling of 21252003 in words is "twenty-one million, two hundred fifty-two thousand, three".