17145767021 has 2 divisors, whose sum is σ = 17145767022. Its totient is φ = 17145767020.

The previous prime is 17145767017. The next prime is 17145767053. The reversal of 17145767021 is 12076754171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16870372996 + 275394025 = 129886^2 + 16595^2 .

It is a cyclic number.

It is not a de Polignac number, because 17145767021 - 2² = 17145767017 is a prime.

It is a super-2 number, since 2×17145767021² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 17145767021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17145767071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8572883510 + 8572883511.

It is an arithmetic number, because the mean of its divisors is an integer number (8572883511).

Almost surely, 2^17145767021 is an apocalyptic number.

It is an amenable number.

17145767021 is a deficient number, since it is larger than the sum of its proper divisors (1).

17145767021 is an equidigital number, since it uses as much as digits as its factorization.

17145767021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82320, while the sum is 41.

The spelling of 17145767021 in words is "seventeen billion, one hundred forty-five million, seven hundred sixty-seven thousand, twenty-one".