21033011011 has 8 divisors (see below), whose sum is σ = 21185519744. Its totient is φ = 20880737280.

The previous prime is 21033010987. The next prime is 21033011017. The reversal of 21033011011 is 11011033012.

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

It is a cyclic number.

It is not a de Polignac number, because 21033011011 - 2²⁵ = 20999456579 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21033010982 and 21033011000.

It is not an unprimeable number, because it can be changed into a prime (21033011017) 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, 122926 + ... + 239116.

It is an arithmetic number, because the mean of its divisors is an integer number (2648189968).

Almost surely, 2^21033011011 is an apocalyptic number.

21033011011 is a deficient number, since it is larger than the sum of its proper divisors (152508733).

21033011011 is a wasteful number, since it uses less digits than its factorization.

21033011011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117501.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 21033011011 its reverse (11011033012), we get a palindrome (32044044023).

The spelling of 21033011011 in words is "twenty-one billion, thirty-three million, eleven thousand, eleven".