21746343329 has 2 divisors, whose sum is σ = 21746343330. Its totient is φ = 21746343328.

The previous prime is 21746343319. The next prime is 21746343331. The reversal of 21746343329 is 92334364712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11358656929 + 10387686400 = 106577^2 + 101920^2 .

It is a cyclic number.

It is not a de Polignac number, because 21746343329 - 2²⁸ = 21477907873 is a prime.

Together with 21746343331, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21746343329.

It is not a weakly prime, because it can be changed into another prime (21746343319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10873171664 + 10873171665.

It is an arithmetic number, because the mean of its divisors is an integer number (10873171665).

Almost surely, 2^21746343329 is an apocalyptic number.

It is an amenable number.

21746343329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21746343329 is an equidigital number, since it uses as much as digits as its factorization.

21746343329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 44.

The spelling of 21746343329 in words is "twenty-one billion, seven hundred forty-six million, three hundred forty-three thousand, three hundred twenty-nine".