21444505123 has 2 divisors, whose sum is σ = 21444505124. Its totient is φ = 21444505122.

The previous prime is 21444505051. The next prime is 21444505127. The reversal of 21444505123 is 32150544412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21444505123 - 2²⁹ = 20907634211 is a prime.

It is not a weakly prime, because it can be changed into another prime (21444505127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10722252561 + 10722252562.

It is an arithmetic number, because the mean of its divisors is an integer number (10722252562).

Almost surely, 2^21444505123 is an apocalyptic number.

21444505123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21444505123 is an equidigital number, since it uses as much as digits as its factorization.

21444505123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19200, while the sum is 31.

The spelling of 21444505123 in words is "twenty-one billion, four hundred forty-four million, five hundred five thousand, one hundred twenty-three".