21355346642239 has 2 divisors, whose sum is σ = 21355346642240. Its totient is φ = 21355346642238.

The previous prime is 21355346642137. The next prime is 21355346642249. The reversal of 21355346642239 is 93224664355312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21355346642239 - 2³⁵ = 21320986903871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21355346642239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21355346642249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10677673321119 + 10677673321120.

It is an arithmetic number, because the mean of its divisors is an integer number (10677673321120).

Almost surely, 2^{21355346642239} is an apocalyptic number.

21355346642239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21355346642239 is an equidigital number, since it uses as much as digits as its factorization.

21355346642239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27993600, while the sum is 55.

The spelling of 21355346642239 in words is "twenty-one trillion, three hundred fifty-five billion, three hundred forty-six million, six hundred forty-two thousand, two hundred thirty-nine".