21184242512819 has 2 divisors, whose sum is σ = 21184242512820. Its totient is φ = 21184242512818.

The previous prime is 21184242512809. The next prime is 21184242512837. The reversal of 21184242512819 is 91821524248112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21184242512819 - 2²⁸ = 21183974077363 is a prime.

It is a super-2 number, since 2×21184242512819² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21184242512809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10592121256409 + 10592121256410.

It is an arithmetic number, because the mean of its divisors is an integer number (10592121256410).

Almost surely, 2^{21184242512819} is an apocalyptic number.

21184242512819 is a deficient number, since it is larger than the sum of its proper divisors (1).

21184242512819 is an equidigital number, since it uses as much as digits as its factorization.

21184242512819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 737280, while the sum is 50.

The spelling of 21184242512819 in words is "twenty-one trillion, one hundred eighty-four billion, two hundred forty-two million, five hundred twelve thousand, eight hundred nineteen".