21103331011 has 4 divisors (see below), whose sum is σ = 24118092592. Its totient is φ = 18088569432.

The previous prime is 21103330999. The next prime is 21103331077. The reversal of 21103331011 is 11013330112.

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 21103331011 - 2⁵ = 21103330979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21103331111) 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 3 ways as a sum of consecutive naturals, for example, 1507380780 + ... + 1507380793.

It is an arithmetic number, because the mean of its divisors is an integer number (6029523148).

Almost surely, 2^21103331011 is an apocalyptic number.

21103331011 is a deficient number, since it is larger than the sum of its proper divisors (3014761581).

21103331011 is an equidigital number, since it uses as much as digits as its factorization.

21103331011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014761580.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 21103331011 its reverse (11013330112), we get a palindrome (32116661123).

The spelling of 21103331011 in words is "twenty-one billion, one hundred three million, three hundred thirty-one thousand, eleven".