21023103311 has 4 divisors (see below), whose sum is σ = 24026403792. Its totient is φ = 18019802832.

The previous prime is 21023103281. The next prime is 21023103319. The reversal of 21023103311 is 11330132012.

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 21023103311 - 2²⁶ = 20955994447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21023103311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023103319) 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, 1501650230 + ... + 1501650243.

It is an arithmetic number, because the mean of its divisors is an integer number (6006600948).

Almost surely, 2^21023103311 is an apocalyptic number.

21023103311 is a deficient number, since it is larger than the sum of its proper divisors (3003300481).

21023103311 is an equidigital number, since it uses as much as digits as its factorization.

21023103311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3003300480.

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

Adding to 21023103311 its reverse (11330132012), we get a palindrome (32353235323).

The spelling of 21023103311 in words is "twenty-one billion, twenty-three million, one hundred three thousand, three hundred eleven".