100021003 has 2 divisors, whose sum is σ = 100021004. Its totient is φ = 100021002.

The previous prime is 100020929. The next prime is 100021039. The reversal of 100021003 is 300120001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 100021003 - 2¹⁷ = 99889931 is a prime.

It is a super-2 number, since 2×100021003² = 20008402082252018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (100021093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50010501 + 50010502.

It is an arithmetic number, because the mean of its divisors is an integer number (50010502).

Almost surely, 2^100021003 is an apocalyptic number.

100021003 is a deficient number, since it is larger than the sum of its proper divisors (1).

100021003 is an equidigital number, since it uses as much as digits as its factorization.

100021003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 100021003 is about 10001.0500948650. The cubic root of 100021003 is about 464.1913768499.

Adding to 100021003 its reverse (300120001), we get a palindrome (400141004).

The spelling of 100021003 in words is "one hundred million, twenty-one thousand, three".