121218317121 has 16 divisors (see below), whose sum is σ = 181082893248. Its totient is φ = 71480088000.

The previous prime is 121218317117. The next prime is 121218317137. The reversal of 121218317121 is 121713812121.

It is not a de Polignac number, because 121218317121 - 2² = 121218317117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121218317321) 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, 49637730 + ... + 49640171.

It is an arithmetic number, because the mean of its divisors is an integer number (11317680828).

Almost surely, 2^121218317121 is an apocalyptic number.

121218317121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121218317121 is a deficient number, since it is larger than the sum of its proper divisors (59864576127).

121218317121 is a wasteful number, since it uses less digits than its factorization.

121218317121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99277952.

The product of its digits is 1344, while the sum is 30.

The spelling of 121218317121 in words is "one hundred twenty-one billion, two hundred eighteen million, three hundred seventeen thousand, one hundred twenty-one".