11003000021 has 8 divisors (see below), whose sum is σ = 11919501720. Its totient is φ = 10156613376.

The previous prime is 11003000017. The next prime is 11003000033. The reversal of 11003000021 is 12000030011.

It can be written as a sum of positive squares in 4 ways, for example, as 723879025 + 10279120996 = 26905^2 + 101386^2 .

It is not a de Polignac number, because 11003000021 - 2² = 11003000017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11002999972 and 11003000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11003000821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2501900 + ... + 2506293.

It is an arithmetic number, because the mean of its divisors is an integer number (1489937715).

Almost surely, 2^11003000021 is an apocalyptic number.

It is an amenable number.

11003000021 is a deficient number, since it is larger than the sum of its proper divisors (916501699).

11003000021 is an frugal number, since it uses more digits than its factorization.

11003000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5008232 (or 5008206 counting only the distinct ones).

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

Adding to 11003000021 its reverse (12000030011), we get a palindrome (23003030032).

The spelling of 11003000021 in words is "eleven billion, three million, twenty-one", and thus it is an aban number and an uban number.