21033440011 has 4 divisors (see below), whose sum is σ = 21038813712. Its totient is φ = 21028066312.

The previous prime is 21033439969. The next prime is 21033440017. The reversal of 21033440011 is 11004433012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21033440011 - 2⁷ = 21033439883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21033440017) 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, 2680975 + ... + 2688808.

It is an arithmetic number, because the mean of its divisors is an integer number (5259703428).

Almost surely, 2^21033440011 is an apocalyptic number.

21033440011 is a deficient number, since it is larger than the sum of its proper divisors (5373701).

21033440011 is an equidigital number, since it uses as much as digits as its factorization.

21033440011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5373700.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21033440011 its reverse (11004433012), we get a palindrome (32037873023).

The spelling of 21033440011 in words is "twenty-one billion, thirty-three million, four hundred forty thousand, eleven".