172125211727 has 12 divisors (see below), whose sum is σ = 202477037040. Its totient is φ = 145878185376.

The previous prime is 172125211697. The next prime is 172125211781. The reversal of 172125211727 is 727112521271.

It is a happy number.

It is not a de Polignac number, because 172125211727 - 2⁶ = 172125211663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172125211627) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19730243 + ... + 19738964.

It is an arithmetic number, because the mean of its divisors is an integer number (16873086420).

Almost surely, 2^172125211727 is an apocalyptic number.

172125211727 is a deficient number, since it is larger than the sum of its proper divisors (30351825313).

172125211727 is an equidigital number, since it uses as much as digits as its factorization.

172125211727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39469310 (or 39469303 counting only the distinct ones).

The product of its digits is 27440, while the sum is 38.

Adding to 172125211727 its reverse (727112521271), we get a palindrome (899237732998).

The spelling of 172125211727 in words is "one hundred seventy-two billion, one hundred twenty-five million, two hundred eleven thousand, seven hundred twenty-seven".