21230033123 has 16 divisors (see below), whose sum is σ = 23612309280. Its totient is φ = 18960708096.

The previous prime is 21230033063. The next prime is 21230033141. The reversal of 21230033123 is 32133003212.

It is a cyclic number.

It is not a de Polignac number, because 21230033123 - 2¹⁰ = 21230032099 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21230033095 and 21230033104.

It is not an unprimeable number, because it can be changed into a prime (21230033023) 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 15 ways as a sum of consecutive naturals, for example, 37190 + ... + 209387.

It is an arithmetic number, because the mean of its divisors is an integer number (1475769330).

Almost surely, 2^21230033123 is an apocalyptic number.

21230033123 is a deficient number, since it is larger than the sum of its proper divisors (2382276157).

21230033123 is a wasteful number, since it uses less digits than its factorization.

21230033123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246806.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21230033123 its reverse (32133003212), we get a palindrome (53363036335).

The spelling of 21230033123 in words is "twenty-one billion, two hundred thirty million, thirty-three thousand, one hundred twenty-three".