21454454159 has 2 divisors, whose sum is σ = 21454454160. Its totient is φ = 21454454158.

The previous prime is 21454454141. The next prime is 21454454167. The reversal of 21454454159 is 95145445412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21454454159 - 2¹⁶ = 21454388623 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21454454179) 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, 10727227079 + 10727227080.

It is an arithmetic number, because the mean of its divisors is an integer number (10727227080).

Almost surely, 2^21454454159 is an apocalyptic number.

21454454159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21454454159 is an equidigital number, since it uses as much as digits as its factorization.

21454454159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576000, while the sum is 44.

The spelling of 21454454159 in words is "twenty-one billion, four hundred fifty-four million, four hundred fifty-four thousand, one hundred fifty-nine".