21023111103 has 32 divisors (see below), whose sum is σ = 28852761600. Its totient is φ = 13611042816.

The previous prime is 21023111101. The next prime is 21023111117. The reversal of 21023111103 is 30111132012.

It is a happy number.

It is not a de Polignac number, because 21023111103 - 2¹ = 21023111101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023111101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6738778 + ... + 6741896.

It is an arithmetic number, because the mean of its divisors is an integer number (901648800).

Almost surely, 2^21023111103 is an apocalyptic number.

21023111103 is a deficient number, since it is larger than the sum of its proper divisors (7829650497).

21023111103 is a wasteful number, since it uses less digits than its factorization.

21023111103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3631.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21023111103 its reverse (30111132012), we get a palindrome (51134243115).

The spelling of 21023111103 in words is "twenty-one billion, twenty-three million, one hundred eleven thousand, one hundred three".