17055149821 has 2 divisors, whose sum is σ = 17055149822. Its totient is φ = 17055149820.

The previous prime is 17055149809. The next prime is 17055149827. The reversal of 17055149821 is 12894155071.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14960714596 + 2094435225 = 122314^2 + 45765^2 .

It is a cyclic number.

It is not a de Polignac number, because 17055149821 - 2⁵ = 17055149789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17055149827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8527574910 + 8527574911.

It is an arithmetic number, because the mean of its divisors is an integer number (8527574911).

Almost surely, 2^17055149821 is an apocalyptic number.

It is an amenable number.

17055149821 is a deficient number, since it is larger than the sum of its proper divisors (1).

17055149821 is an equidigital number, since it uses as much as digits as its factorization.

17055149821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 43.

The spelling of 17055149821 in words is "seventeen billion, fifty-five million, one hundred forty-nine thousand, eight hundred twenty-one".