21133321123 has 2 divisors, whose sum is σ = 21133321124. Its totient is φ = 21133321122.

The previous prime is 21133321051. The next prime is 21133321169. The reversal of 21133321123 is 32112333112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21133321123 is a prime.

It is a super-2 number, since 2×21133321123² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21133321094 and 21133321103.

It is not a weakly prime, because it can be changed into another prime (21133321423) 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 as a sum of consecutive naturals, namely, 10566660561 + 10566660562.

It is an arithmetic number, because the mean of its divisors is an integer number (10566660562).

Almost surely, 2^21133321123 is an apocalyptic number.

21133321123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133321123 is an equidigital number, since it uses as much as digits as its factorization.

21133321123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 22.

Adding to 21133321123 its reverse (32112333112), we get a palindrome (53245654235).

The spelling of 21133321123 in words is "twenty-one billion, one hundred thirty-three million, three hundred twenty-one thousand, one hundred twenty-three".