21331223321123 has 16 divisors (see below), whose sum is σ = 22681028129760. Its totient is φ = 19992124379136.

The previous prime is 21331223321101. The next prime is 21331223321137. The reversal of 21331223321123 is 32112332213312.

It is a cyclic number.

It is not a de Polignac number, because 21331223321123 - 2¹⁴ = 21331223304739 is a prime.

It is a super-2 number, since 2×21331223321123² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21331223321153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2333540 + ... + 6935982.

It is an arithmetic number, because the mean of its divisors is an integer number (1417564258110).

Almost surely, 2^{21331223321123} is an apocalyptic number.

21331223321123 is a deficient number, since it is larger than the sum of its proper divisors (1349804808637).

21331223321123 is a wasteful number, since it uses less digits than its factorization.

21331223321123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4603606.

The product of its digits is 7776, while the sum is 29.

Adding to 21331223321123 its reverse (32112332213312), we get a palindrome (53443555534435).

The spelling of 21331223321123 in words is "twenty-one trillion, three hundred thirty-one billion, two hundred twenty-three million, three hundred twenty-one thousand, one hundred twenty-three".