1003120021 has 4 divisors (see below), whose sum is σ = 1017248544. Its totient is φ = 988991500.

The previous prime is 1003120007. The next prime is 1003120031. The reversal of 1003120021 is 1200213001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1200213001 = 13 ⋅92324077.

It is a cyclic number.

It is not a de Polignac number, because 1003120021 - 2⁷ = 1003119893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1003120031) 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 3 ways as a sum of consecutive naturals, for example, 7064155 + ... + 7064296.

It is an arithmetic number, because the mean of its divisors is an integer number (254312136).

Almost surely, 2^1003120021 is an apocalyptic number.

It is an amenable number.

1003120021 is a deficient number, since it is larger than the sum of its proper divisors (14128523).

1003120021 is an equidigital number, since it uses as much as digits as its factorization.

1003120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14128522.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1003120021 is about 31672.0700460200. The cubic root of 1003120021 is about 1001.0389272564.

Adding to 1003120021 its reverse (1200213001), we get a palindrome (2203333022).

The spelling of 1003120021 in words is "one billion, three million, one hundred twenty thousand, twenty-one".