172116510121 has 4 divisors (see below), whose sum is σ = 179599836672. Its totient is φ = 164633183572.

The previous prime is 172116510109. The next prime is 172116510131. The reversal of 172116510121 is 121015611271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 172116510121 - 2¹¹ = 172116508073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172116510121.

It is not an unprimeable number, because it can be changed into a prime (172116510131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3741663241 + ... + 3741663286.

It is an arithmetic number, because the mean of its divisors is an integer number (44899959168).

Almost surely, 2^172116510121 is an apocalyptic number.

It is an amenable number.

172116510121 is a deficient number, since it is larger than the sum of its proper divisors (7483326551).

172116510121 is an equidigital number, since it uses as much as digits as its factorization.

172116510121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7483326550.

The product of its (nonzero) digits is 840, while the sum is 28.

The spelling of 172116510121 in words is "one hundred seventy-two billion, one hundred sixteen million, five hundred ten thousand, one hundred twenty-one".