21103123013233 has 24 divisors (see below), whose sum is σ = 23650642962720. Its totient is φ = 18773929774080.

The previous prime is 21103123013201. The next prime is 21103123013237. The reversal of 21103123013233 is 33231032130112.

It is not a de Polignac number, because 21103123013233 - 2⁵ = 21103123013201 is a prime.

It is a super-2 number, since 2×21103123013233² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21103123013198 and 21103123013207.

It is not an unprimeable number, because it can be changed into a prime (21103123013237) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1905208 + ... + 6770233.

It is an arithmetic number, because the mean of its divisors is an integer number (985443456780).

Almost surely, 2^{21103123013233} is an apocalyptic number.

It is an amenable number.

21103123013233 is a deficient number, since it is larger than the sum of its proper divisors (2547519949487).

21103123013233 is a wasteful number, since it uses less digits than its factorization.

21103123013233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8675937 (or 8675920 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 21103123013233 its reverse (33231032130112), we get a palindrome (54334155143345).

The spelling of 21103123013233 in words is "twenty-one trillion, one hundred three billion, one hundred twenty-three million, thirteen thousand, two hundred thirty-three".