21180600017 has 2 divisors, whose sum is σ = 21180600018. Its totient is φ = 21180600016.

The previous prime is 21180599911. The next prime is 21180600059. The reversal of 21180600017 is 71000608112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10849097281 + 10331502736 = 104159^2 + 101644^2 .

It is a cyclic number.

It is not a de Polignac number, because 21180600017 - 2²² = 21176405713 is a prime.

It is not a weakly prime, because it can be changed into another prime (21180600097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10590300008 + 10590300009.

It is an arithmetic number, because the mean of its divisors is an integer number (10590300009).

Almost surely, 2^21180600017 is an apocalyptic number.

It is an amenable number.

21180600017 is a deficient number, since it is larger than the sum of its proper divisors (1).

21180600017 is an equidigital number, since it uses as much as digits as its factorization.

21180600017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 26.

The spelling of 21180600017 in words is "twenty-one billion, one hundred eighty million, six hundred thousand, seventeen".