21055000159 has 2 divisors, whose sum is σ = 21055000160. Its totient is φ = 21055000158.

The previous prime is 21055000097. The next prime is 21055000163. The reversal of 21055000159 is 95100055012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21055000159 - 2²⁷ = 20920782431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21055000199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10527500079 + 10527500080.

It is an arithmetic number, because the mean of its divisors is an integer number (10527500080).

Almost surely, 2^21055000159 is an apocalyptic number.

21055000159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21055000159 is an equidigital number, since it uses as much as digits as its factorization.

21055000159 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2250, while the sum is 28.

The spelling of 21055000159 in words is "twenty-one billion, fifty-five million, one hundred fifty-nine", and thus it is an aban number.