21003000011 has 8 divisors (see below), whose sum is σ = 24016552704. Its totient is φ = 17992728360.

The previous prime is 21003000001. The next prime is 21003000037. The reversal of 21003000011 is 11000030012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21003000011 is a prime.

It is a super-2 number, since 2×21003000011² (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 (21003000001) 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 7 ways as a sum of consecutive naturals, for example, 806525 + ... + 832158.

It is an arithmetic number, because the mean of its divisors is an integer number (3002069088).

Almost surely, 2^21003000011 is an apocalyptic number.

21003000011 is a deficient number, since it is larger than the sum of its proper divisors (3013552693).

21003000011 is a wasteful number, since it uses less digits than its factorization.

21003000011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640521.

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

Adding to 21003000011 its reverse (11000030012), we get a palindrome (32003030023).

The spelling of 21003000011 in words is "twenty-one billion, three million, eleven", and thus it is an aban number and an uban number.