21534535159 has 2 divisors, whose sum is σ = 21534535160. Its totient is φ = 21534535158.

The previous prime is 21534535123. The next prime is 21534535181. The reversal of 21534535159 is 95153543512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21534535159 - 2⁷ = 21534535031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21534535199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10767267579 + 10767267580.

It is an arithmetic number, because the mean of its divisors is an integer number (10767267580).

Almost surely, 2^21534535159 is an apocalyptic number.

21534535159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21534535159 is an equidigital number, since it uses as much as digits as its factorization.

21534535159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 405000, while the sum is 43.

The spelling of 21534535159 in words is "twenty-one billion, five hundred thirty-four million, five hundred thirty-five thousand, one hundred fifty-nine".