121551016171 has 16 divisors (see below), whose sum is σ = 134144720640. Its totient is φ = 109422766080.

The previous prime is 121551016127. The next prime is 121551016201. The reversal of 121551016171 is 171610155121.

It is a cyclic number.

It is not a de Polignac number, because 121551016171 - 2²⁷ = 121416798443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121551016871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1407291 + ... + 1491163.

It is an arithmetic number, because the mean of its divisors is an integer number (8384045040).

Almost surely, 2^121551016171 is an apocalyptic number.

121551016171 is a deficient number, since it is larger than the sum of its proper divisors (12593704469).

121551016171 is a wasteful number, since it uses less digits than its factorization.

121551016171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86646.

The product of its (nonzero) digits is 2100, while the sum is 31.

The spelling of 121551016171 in words is "one hundred twenty-one billion, five hundred fifty-one million, sixteen thousand, one hundred seventy-one".