21118847016419 has 2 divisors, whose sum is σ = 21118847016420. Its totient is φ = 21118847016418.

The previous prime is 21118847016331. The next prime is 21118847016457. The reversal of 21118847016419 is 91461074881112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21118847016419 - 2¹² = 21118847012323 is a prime.

It is a super-2 number, since 2×21118847016419² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21118847016469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10559423508209 + 10559423508210.

It is an arithmetic number, because the mean of its divisors is an integer number (10559423508210).

Almost surely, 2^{21118847016419} is an apocalyptic number.

21118847016419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21118847016419 is an equidigital number, since it uses as much as digits as its factorization.

21118847016419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 774144, while the sum is 53.

The spelling of 21118847016419 in words is "twenty-one trillion, one hundred eighteen billion, eight hundred forty-seven million, sixteen thousand, four hundred nineteen".