21353342239 has 2 divisors, whose sum is σ = 21353342240. Its totient is φ = 21353342238.

The previous prime is 21353342191. The next prime is 21353342243. The reversal of 21353342239 is 93224335312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21353342239 - 2⁷ = 21353342111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21353342198 and 21353342207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21353342839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10676671119 + 10676671120.

It is an arithmetic number, because the mean of its divisors is an integer number (10676671120).

Almost surely, 2^21353342239 is an apocalyptic number.

21353342239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21353342239 is an equidigital number, since it uses as much as digits as its factorization.

21353342239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 37.

The spelling of 21353342239 in words is "twenty-one billion, three hundred fifty-three million, three hundred forty-two thousand, two hundred thirty-nine".