21231333123 has 192 divisors, whose sum is σ = 39820225536. Its totient is φ = 9785318400.

The previous prime is 21231333121. The next prime is 21231333163. The reversal of 21231333123 is 32133313212.

It is not a de Polignac number, because 21231333123 - 2¹ = 21231333121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21231333093 and 21231333102.

It is not an unprimeable number, because it can be changed into a prime (21231333121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 117300093 + ... + 117300273.

It is an arithmetic number, because the mean of its divisors is an integer number (207397008).

Almost surely, 2^21231333123 is an apocalyptic number.

21231333123 is a deficient number, since it is larger than the sum of its proper divisors (18588892413).

21231333123 is a wasteful number, since it uses less digits than its factorization.

21231333123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 335 counting only the distinct ones).

The product of its digits is 1944, while the sum is 24.

Adding to 21231333123 its reverse (32133313212), we get a palindrome (53364646335).

The spelling of 21231333123 in words is "twenty-one billion, two hundred thirty-one million, three hundred thirty-three thousand, one hundred twenty-three".