21436517059 has 2 divisors, whose sum is σ = 21436517060. Its totient is φ = 21436517058.

The previous prime is 21436516973. The next prime is 21436517101. The reversal of 21436517059 is 95071563412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21436517059 - 2¹⁵ = 21436484291 is a prime.

It is not a weakly prime, because it can be changed into another prime (21436517759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10718258529 + 10718258530.

It is an arithmetic number, because the mean of its divisors is an integer number (10718258530).

Almost surely, 2^21436517059 is an apocalyptic number.

21436517059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21436517059 is an equidigital number, since it uses as much as digits as its factorization.

21436517059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 21436517059 in words is "twenty-one billion, four hundred thirty-six million, five hundred seventeen thousand, fifty-nine".