172021107277 has 2 divisors, whose sum is σ = 172021107278. Its totient is φ = 172021107276.

The previous prime is 172021107241. The next prime is 172021107311. The reversal of 172021107277 is 772701120271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156393357156 + 15627750121 = 395466^2 + 125011^2 .

It is an emirp because it is prime and its reverse (772701120271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172021107277 - 2¹⁵ = 172021074509 is a prime.

It is a super-2 number, since 2×172021107277² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172021107217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86010553638 + 86010553639.

It is an arithmetic number, because the mean of its divisors is an integer number (86010553639).

Almost surely, 2^172021107277 is an apocalyptic number.

It is an amenable number.

172021107277 is a deficient number, since it is larger than the sum of its proper divisors (1).

172021107277 is an equidigital number, since it uses as much as digits as its factorization.

172021107277 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19208, while the sum is 37.

The spelling of 172021107277 in words is "one hundred seventy-two billion, twenty-one million, one hundred seven thousand, two hundred seventy-seven".