170212755479021 has 2 divisors, whose sum is σ = 170212755479022. Its totient is φ = 170212755479020.

The previous prime is 170212755478981. The next prime is 170212755479069. The reversal of 170212755479021 is 120974557212071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119585816380900 + 50626939098121 = 10935530^2 + 7115261^2 .

It is a cyclic number.

It is not a de Polignac number, because 170212755479021 - 2⁶ = 170212755478957 is a prime.

It is a super-2 number, since 2×170212755479021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170212755479071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85106377739510 + 85106377739511.

It is an arithmetic number, because the mean of its divisors is an integer number (85106377739511).

Almost surely, 2^{170212755479021} is an apocalyptic number.

It is an amenable number.

170212755479021 is a deficient number, since it is larger than the sum of its proper divisors (1).

170212755479021 is an equidigital number, since it uses as much as digits as its factorization.

170212755479021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2469600, while the sum is 53.

The spelling of 170212755479021 in words is "one hundred seventy trillion, two hundred twelve billion, seven hundred fifty-five million, four hundred seventy-nine thousand, twenty-one".