21223132123 has 2 divisors, whose sum is σ = 21223132124. Its totient is φ = 21223132122.

The previous prime is 21223132109. The next prime is 21223132153. The reversal of 21223132123 is 32123132212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21223132123 is a prime.

It is a super-2 number, since 2×21223132123² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21223132094 and 21223132103.

It is not a weakly prime, because it can be changed into another prime (21223132153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611566061 + 10611566062.

It is an arithmetic number, because the mean of its divisors is an integer number (10611566062).

Almost surely, 2^21223132123 is an apocalyptic number.

21223132123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223132123 is an equidigital number, since it uses as much as digits as its factorization.

21223132123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 22.

Adding to 21223132123 its reverse (32123132212), we get a palindrome (53346264335).

The spelling of 21223132123 in words is "twenty-one billion, two hundred twenty-three million, one hundred thirty-two thousand, one hundred twenty-three".