21133303123 has 2 divisors, whose sum is σ = 21133303124. Its totient is φ = 21133303122.

The previous prime is 21133303099. The next prime is 21133303133. The reversal of 21133303123 is 32130333112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21133303123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21133303094 and 21133303103.

It is not a weakly prime, because it can be changed into another prime (21133303133) 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, 10566651561 + 10566651562.

It is an arithmetic number, because the mean of its divisors is an integer number (10566651562).

Almost surely, 2^21133303123 is an apocalyptic number.

21133303123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133303123 is an equidigital number, since it uses as much as digits as its factorization.

21133303123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21133303123 its reverse (32130333112), we get a palindrome (53263636235).

The spelling of 21133303123 in words is "twenty-one billion, one hundred thirty-three million, three hundred three thousand, one hundred twenty-three".