121551016172 has 12 divisors (see below), whose sum is σ = 212917063800. Its totient is φ = 60717569376.

The previous prime is 121551016127. The next prime is 121551016201. The reversal of 121551016172 is 271610155121.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14479958 + ... + 14488349.

It is an arithmetic number, because the mean of its divisors is an integer number (17743088650).

Almost surely, 2^121551016172 is an apocalyptic number.

It is an amenable number.

121551016172 is a deficient number, since it is larger than the sum of its proper divisors (91366047628).

121551016172 is a wasteful number, since it uses less digits than its factorization.

121551016172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28969360 (or 28969358 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 32.

The spelling of 121551016172 in words is "one hundred twenty-one billion, five hundred fifty-one million, sixteen thousand, one hundred seventy-two".