21002130003 has 16 divisors (see below), whose sum is σ = 28593681696. Its totient is φ = 13708800000.

The previous prime is 21002129999. The next prime is 21002130031. The reversal of 21002130003 is 30003120012.

It is a happy number.

It is not a de Polignac number, because 21002130003 - 2² = 21002129999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21002130503) 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 15 ways as a sum of consecutive naturals, for example, 319998 + ... + 380003.

It is an arithmetic number, because the mean of its divisors is an integer number (1787105106).

Almost surely, 2^21002130003 is an apocalyptic number.

21002130003 is a deficient number, since it is larger than the sum of its proper divisors (7591551693).

21002130003 is a wasteful number, since it uses less digits than its factorization.

21002130003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700214.

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

Adding to 21002130003 its reverse (30003120012), we get a palindrome (51005250015).

Subtracting 21002130003 from its reverse (30003120012), we obtain a palindrome (9000990009).

The spelling of 21002130003 in words is "twenty-one billion, two million, one hundred thirty thousand, three".