21839190617 has 2 divisors, whose sum is σ = 21839190618. Its totient is φ = 21839190616.

The previous prime is 21839190559. The next prime is 21839190643. The reversal of 21839190617 is 71609193812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14500013056 + 7339177561 = 120416^2 + 85669^2 .

It is a cyclic number.

It is not a de Polignac number, because 21839190617 - 2⁶ = 21839190553 is a prime.

It is not a weakly prime, because it can be changed into another prime (21839190697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10919595308 + 10919595309.

It is an arithmetic number, because the mean of its divisors is an integer number (10919595309).

Almost surely, 2^21839190617 is an apocalyptic number.

It is an amenable number.

21839190617 is a deficient number, since it is larger than the sum of its proper divisors (1).

21839190617 is an equidigital number, since it uses as much as digits as its factorization.

21839190617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 47.

The spelling of 21839190617 in words is "twenty-one billion, eight hundred thirty-nine million, one hundred ninety thousand, six hundred seventeen".