172011621117 has 32 divisors (see below), whose sum is σ = 264718784512. Its totient is φ = 97315608384.

The previous prime is 172011621077. The next prime is 172011621127. The reversal of 172011621117 is 711126110271.

It is not a de Polignac number, because 172011621117 - 2³⁰ = 170937879293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172011621127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15193743 + ... + 15205059.

It is an arithmetic number, because the mean of its divisors is an integer number (8272462016).

Almost surely, 2^172011621117 is an apocalyptic number.

It is an amenable number.

172011621117 is a deficient number, since it is larger than the sum of its proper divisors (92707163395).

172011621117 is a wasteful number, since it uses less digits than its factorization.

172011621117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18457.

The product of its (nonzero) digits is 1176, while the sum is 30.

Adding to 172011621117 its reverse (711126110271), we get a palindrome (883137731388).

The spelling of 172011621117 in words is "one hundred seventy-two billion, eleven million, six hundred twenty-one thousand, one hundred seventeen".