21354727216519 has 2 divisors, whose sum is σ = 21354727216520. Its totient is φ = 21354727216518.

The previous prime is 21354727216397. The next prime is 21354727216531. The reversal of 21354727216519 is 91561272745312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21354727216519 - 2²¹ = 21354725119367 is a prime.

It is a super-2 number, since 2×21354727216519² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21354727216519.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21354727216549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10677363608259 + 10677363608260.

It is an arithmetic number, because the mean of its divisors is an integer number (10677363608260).

Almost surely, 2^{21354727216519} is an apocalyptic number.

21354727216519 is a deficient number, since it is larger than the sum of its proper divisors (1).

21354727216519 is an equidigital number, since it uses as much as digits as its factorization.

21354727216519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6350400, while the sum is 55.

The spelling of 21354727216519 in words is "twenty-one trillion, three hundred fifty-four billion, seven hundred twenty-seven million, two hundred sixteen thousand, five hundred nineteen".