21023330123 has 2 divisors, whose sum is σ = 21023330124. Its totient is φ = 21023330122.

The previous prime is 21023330117. The next prime is 21023330131. The reversal of 21023330123 is 32103332012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21023330123 - 2⁶ = 21023330059 is a prime.

It is a super-4 number, since 4×21023330123⁴ (a number of 42 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21023330095 and 21023330104.

It is not a weakly prime, because it can be changed into another prime (21023330183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511665061 + 10511665062.

It is an arithmetic number, because the mean of its divisors is an integer number (10511665062).

Almost surely, 2^21023330123 is an apocalyptic number.

21023330123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023330123 is an equidigital number, since it uses as much as digits as its factorization.

21023330123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21023330123 its reverse (32103332012), we get a palindrome (53126662135).

The spelling of 21023330123 in words is "twenty-one billion, twenty-three million, three hundred thirty thousand, one hundred twenty-three".