21160134215447 has 2 divisors, whose sum is σ = 21160134215448. Its totient is φ = 21160134215446.

The previous prime is 21160134215401. The next prime is 21160134215497. The reversal of 21160134215447 is 74451243106112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21160134215447 - 2¹⁶ = 21160134149911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21160134215497) 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, 10580067107723 + 10580067107724.

It is an arithmetic number, because the mean of its divisors is an integer number (10580067107724).

Almost surely, 2^{21160134215447} is an apocalyptic number.

21160134215447 is a deficient number, since it is larger than the sum of its proper divisors (1).

21160134215447 is an equidigital number, since it uses as much as digits as its factorization.

21160134215447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 41.

The spelling of 21160134215447 in words is "twenty-one trillion, one hundred sixty billion, one hundred thirty-four million, two hundred fifteen thousand, four hundred forty-seven".