21344554123 has 2 divisors, whose sum is σ = 21344554124. Its totient is φ = 21344554122.

The previous prime is 21344554087. The next prime is 21344554129. The reversal of 21344554123 is 32145544312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21344554123 - 2⁹ = 21344553611 is a prime.

It is not a weakly prime, because it can be changed into another prime (21344554129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672277061 + 10672277062.

It is an arithmetic number, because the mean of its divisors is an integer number (10672277062).

Almost surely, 2^21344554123 is an apocalyptic number.

21344554123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344554123 is an equidigital number, since it uses as much as digits as its factorization.

21344554123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 34.

The spelling of 21344554123 in words is "twenty-one billion, three hundred forty-four million, five hundred fifty-four thousand, one hundred twenty-three".