21346420559 has 2 divisors, whose sum is σ = 21346420560. Its totient is φ = 21346420558.

The previous prime is 21346420553. The next prime is 21346420639. The reversal of 21346420559 is 95502464312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21346420559 - 2²⁴ = 21329643343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21346420553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10673210279 + 10673210280.

It is an arithmetic number, because the mean of its divisors is an integer number (10673210280).

Almost surely, 2^21346420559 is an apocalyptic number.

21346420559 is a deficient number, since it is larger than the sum of its proper divisors (1).

21346420559 is an equidigital number, since it uses as much as digits as its factorization.

21346420559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 21346420559 in words is "twenty-one billion, three hundred forty-six million, four hundred twenty thousand, five hundred fifty-nine".