2101002003 has 8 divisors (see below), whose sum is σ = 3112595600. Its totient is φ = 1400667984.

The previous prime is 2101001983. The next prime is 2101002011. The reversal of 2101002003 is 3002001012.

It is a happy number.

It is not a de Polignac number, because 2101002003 - 2¹² = 2100997907 is a prime.

It is a super-2 number, since 2×2101002003² = 8828418833220024018, which contains 22 as substring.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101002023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38907418 + ... + 38907471.

It is an arithmetic number, because the mean of its divisors is an integer number (389074450).

Almost surely, 2^2101002003 is an apocalyptic number.

2101002003 is a deficient number, since it is larger than the sum of its proper divisors (1011593597).

2101002003 is an equidigital number, since it uses as much as digits as its factorization.

2101002003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77814898 (or 77814892 counting only the distinct ones).

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

The square root of 2101002003 is about 45836.6883947783. The cubic root of 2101002003 is about 1280.7828062792.

Adding to 2101002003 its reverse (3002001012), we get a palindrome (5103003015).

Subtracting 2101002003 from its reverse (3002001012), we obtain a palindrome (900999009).

The spelling of 2101002003 in words is "two billion, one hundred one million, two thousand, three".