20021010003 has 20 divisors (see below), whose sum is σ = 30317635128. Its totient is φ = 13164495840.

The previous prime is 20021009999. The next prime is 20021010029. The reversal of 20021010003 is 30001012002.

It is a happy number.

It is not a de Polignac number, because 20021010003 - 2² = 20021009999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (20021010073) 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 19 ways as a sum of consecutive naturals, for example, 1687053 + ... + 1698878.

Almost surely, 2^20021010003 is an apocalyptic number.

20021010003 is a deficient number, since it is larger than the sum of its proper divisors (10296625125).

20021010003 is an equidigital number, since it uses as much as digits as its factorization.

20021010003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3386016 (or 3386007 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 20021010003 its reverse (30001012002), we get a palindrome (50022022005).

The spelling of 20021010003 in words is "twenty billion, twenty-one million, ten thousand, three".