21365564501419 has 2 divisors, whose sum is σ = 21365564501420. Its totient is φ = 21365564501418.

The previous prime is 21365564501389. The next prime is 21365564501539. The reversal of 21365564501419 is 91410546556312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21365564501419 - 2⁷ = 21365564501291 is a prime.

It is a super-2 number, since 2×21365564501419² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21365564508419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10682782250709 + 10682782250710.

It is an arithmetic number, because the mean of its divisors is an integer number (10682782250710).

Almost surely, 2^{21365564501419} is an apocalyptic number.

21365564501419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21365564501419 is an equidigital number, since it uses as much as digits as its factorization.

21365564501419 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888000, while the sum is 52.

The spelling of 21365564501419 in words is "twenty-one trillion, three hundred sixty-five billion, five hundred sixty-four million, five hundred one thousand, four hundred nineteen".