21547982522519 has 2 divisors, whose sum is σ = 21547982522520. Its totient is φ = 21547982522518.

The previous prime is 21547982522483. The next prime is 21547982522557. The reversal of 21547982522519 is 91522528974512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21547982522519 - 2²⁸ = 21547714087063 is a prime.

It is a super-2 number, since 2×21547982522519² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21547982522419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10773991261259 + 10773991261260.

It is an arithmetic number, because the mean of its divisors is an integer number (10773991261260).

Almost surely, 2^{21547982522519} is an apocalyptic number.

21547982522519 is a deficient number, since it is larger than the sum of its proper divisors (1).

21547982522519 is an equidigital number, since it uses as much as digits as its factorization.

21547982522519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288000, while the sum is 62.

The spelling of 21547982522519 in words is "twenty-one trillion, five hundred forty-seven billion, nine hundred eighty-two million, five hundred twenty-two thousand, five hundred nineteen".