21003630011 has 32 divisors (see below), whose sum is σ = 26323315200. Its totient is φ = 16315130880.

The previous prime is 21003629963. The next prime is 21003630013. The reversal of 21003630011 is 11003630012.

It is a cyclic number.

It is not a de Polignac number, because 21003630011 - 2²⁶ = 20936521147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21003630013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4985696 + ... + 4989906.

It is an arithmetic number, because the mean of its divisors is an integer number (822603600).

Almost surely, 2^21003630011 is an apocalyptic number.

21003630011 is a deficient number, since it is larger than the sum of its proper divisors (5319685189).

21003630011 is a wasteful number, since it uses less digits than its factorization.

21003630011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5219.

The product of its (nonzero) digits is 108, while the sum is 17.

Subtracting from 21003630011 its reverse (11003630012), we obtain a palindrome (9999999999).

The spelling of 21003630011 in words is "twenty-one billion, three million, six hundred thirty thousand, eleven".