21030729003 has 64 divisors (see below), whose sum is σ = 33116160000. Its totient is φ = 13169550240.

The previous prime is 21030728981. The next prime is 21030729017. The reversal of 21030729003 is 30092703012.

It is not a de Polignac number, because 21030729003 - 2¹⁰ = 21030727979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21030729023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6008748 + ... + 6012246.

It is an arithmetic number, because the mean of its divisors is an integer number (517440000).

Almost surely, 2^21030729003 is an apocalyptic number.

21030729003 is a deficient number, since it is larger than the sum of its proper divisors (12085430997).

21030729003 is a wasteful number, since it uses less digits than its factorization.

21030729003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3749 (or 3743 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The spelling of 21030729003 in words is "twenty-one billion, thirty million, seven hundred twenty-nine thousand, three".