21619179930869 has 2 divisors, whose sum is σ = 21619179930870. Its totient is φ = 21619179930868.

The previous prime is 21619179930809. The next prime is 21619179930877. The reversal of 21619179930869 is 96803997191612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21616036983025 + 3142947844 = 4649305^2 + 56062^2 .

It is a cyclic number.

It is not a de Polignac number, because 21619179930869 - 2⁴⁰ = 20519668303093 is a prime.

It is a super-2 number, since 2×21619179930869² (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 (21619179930809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10809589965434 + 10809589965435.

It is an arithmetic number, because the mean of its divisors is an integer number (10809589965435).

Almost surely, 2^{21619179930869} is an apocalyptic number.

It is an amenable number.

21619179930869 is a deficient number, since it is larger than the sum of its proper divisors (1).

21619179930869 is an equidigital number, since it uses as much as digits as its factorization.

21619179930869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 79361856, while the sum is 71.

The spelling of 21619179930869 in words is "twenty-one trillion, six hundred nineteen billion, one hundred seventy-nine million, nine hundred thirty thousand, eight hundred sixty-nine".