21342342289 has 2 divisors, whose sum is σ = 21342342290. Its totient is φ = 21342342288.

The previous prime is 21342342277. The next prime is 21342342323. The reversal of 21342342289 is 98224324312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15074928400 + 6267413889 = 122780^2 + 79167^2 .

It is a cyclic number.

It is not a de Polignac number, because 21342342289 - 2¹¹ = 21342340241 is a prime.

It is not a weakly prime, because it can be changed into another prime (21342342239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671171144 + 10671171145.

It is an arithmetic number, because the mean of its divisors is an integer number (10671171145).

Almost surely, 2^21342342289 is an apocalyptic number.

It is an amenable number.

21342342289 is a deficient number, since it is larger than the sum of its proper divisors (1).

21342342289 is an equidigital number, since it uses as much as digits as its factorization.

21342342289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 40.

The spelling of 21342342289 in words is "twenty-one billion, three hundred forty-two million, three hundred forty-two thousand, two hundred eighty-nine".