21123313131233 has 24 divisors (see below), whose sum is σ = 22558439083200. Its totient is φ = 19774960254720.

The previous prime is 21123313131187. The next prime is 21123313131247. The reversal of 21123313131233 is 33213131332112.

It is a de Polignac number, because none of the positive numbers 2^k-21123313131233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21123313131196 and 21123313131205.

It is not an unprimeable number, because it can be changed into a prime (21123313131293) 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, 198992510 + ... + 199098632.

It is an arithmetic number, because the mean of its divisors is an integer number (939934961800).

Almost surely, 2^{21123313131233} is an apocalyptic number.

It is an amenable number.

21123313131233 is a deficient number, since it is larger than the sum of its proper divisors (1435125951967).

21123313131233 is a wasteful number, since it uses less digits than its factorization.

21123313131233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109817 (or 109800 counting only the distinct ones).

The product of its digits is 5832, while the sum is 29.

Adding to 21123313131233 its reverse (33213131332112), we get a palindrome (54336444463345).

The spelling of 21123313131233 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred thirteen million, one hundred thirty-one thousand, two hundred thirty-three".