21344410123 has 2 divisors, whose sum is σ = 21344410124. Its totient is φ = 21344410122.

The previous prime is 21344410091. The next prime is 21344410127. The reversal of 21344410123 is 32101444312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21344410123 - 2⁵ = 21344410091 is a prime.

It is not a weakly prime, because it can be changed into another prime (21344410127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672205061 + 10672205062.

It is an arithmetic number, because the mean of its divisors is an integer number (10672205062).

Almost surely, 2^21344410123 is an apocalyptic number.

21344410123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344410123 is an equidigital number, since it uses as much as digits as its factorization.

21344410123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21344410123 its reverse (32101444312), we get a palindrome (53445854435).

The spelling of 21344410123 in words is "twenty-one billion, three hundred forty-four million, four hundred ten thousand, one hundred twenty-three".