21130002003 has 16 divisors (see below), whose sum is σ = 30756064896. Its totient is φ = 12797096640.

The previous prime is 21130001983. The next prime is 21130002007. The reversal of 21130002003 is 30020003112.

It is a happy number.

It is not a de Polignac number, because 21130002003 - 2¹⁰ = 21130000979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21130002003.

It is not an unprimeable number, because it can be changed into a prime (21130002007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176125 + ... + 270702.

It is an arithmetic number, because the mean of its divisors is an integer number (1922254056).

Almost surely, 2^21130002003 is an apocalyptic number.

21130002003 is a deficient number, since it is larger than the sum of its proper divisors (9626062893).

21130002003 is a wasteful number, since it uses less digits than its factorization.

21130002003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448274.

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21130002003 its reverse (30020003112), we get a palindrome (51150005115).

The spelling of 21130002003 in words is "twenty-one billion, one hundred thirty million, two thousand, three".