121217066985 has 64 divisors (see below), whose sum is σ = 238195648512. Its totient is φ = 51375430656.

The previous prime is 121217066941. The next prime is 121217067001. The reversal of 121217066985 is 589660712121.

It is a happy number.

It is not a de Polignac number, because 121217066985 - 2⁶ = 121217066921 is a prime.

It is a super-3 number, since 3×121217066985³ (a number of 34 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 387187 + ... + 626376.

It is an arithmetic number, because the mean of its divisors is an integer number (3721807008).

Almost surely, 2^121217066985 is an apocalyptic number.

121217066985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121217066985 is a deficient number, since it is larger than the sum of its proper divisors (116978581527).

121217066985 is a wasteful number, since it uses less digits than its factorization.

121217066985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013662.

The product of its (nonzero) digits is 362880, while the sum is 48.

The spelling of 121217066985 in words is "one hundred twenty-one billion, two hundred seventeen million, sixty-six thousand, nine hundred eighty-five".