10001021003 has 4 divisors (see below), whose sum is σ = 10001610720. Its totient is φ = 10000431288.

The previous prime is 10001020999. The next prime is 10001021039. The reversal of 10001021003 is 30012010001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30012010001 = 17 ⋅1765412353.

It is a cyclic number.

It is not a de Polignac number, because 10001021003 - 2² = 10001020999 is a prime.

It is a super-2 number, since 2×10001021003² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10001021803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268643 + ... + 303596.

It is an arithmetic number, because the mean of its divisors is an integer number (2500402680).

Almost surely, 2^10001021003 is an apocalyptic number.

10001021003 is a deficient number, since it is larger than the sum of its proper divisors (589717).

10001021003 is an equidigital number, since it uses as much as digits as its factorization.

10001021003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589716.

The product of its (nonzero) digits is 6, while the sum is 8.

Adding to 10001021003 its reverse (30012010001), we get a palindrome (40013031004).

The spelling of 10001021003 in words is "ten billion, one million, twenty-one thousand, three".