21015240003 has 48 divisors (see below), whose sum is σ = 31035004000. Its totient is φ = 13701187584.

The previous prime is 21015239969. The next prime is 21015240041. The reversal of 21015240003 is 30004251012.

21015240003 is a `hidden beast` number, since 210 + 1 + 52 + 400 + 0 + 3 = 666.

It is not a de Polignac number, because 21015240003 - 2⁶ = 21015239939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21015241003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31225875 + ... + 31226547.

Almost surely, 2^21015240003 is an apocalyptic number.

21015240003 is a deficient number, since it is larger than the sum of its proper divisors (10019763997).

21015240003 is a wasteful number, since it uses less digits than its factorization.

21015240003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156 (or 1153 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 21015240003 its reverse (30004251012), we get a palindrome (51019491015).

The spelling of 21015240003 in words is "twenty-one billion, fifteen million, two hundred forty thousand, three".