121221021201985 has 64 divisors (see below), whose sum is σ = 155056515812352. Its totient is φ = 90790919847936.

The previous prime is 121221021201977. The next prime is 121221021201989. The reversal of 121221021201985 is 589102120122121.

It is a cyclic number.

It is not a de Polignac number, because 121221021201985 - 2³ = 121221021201977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221021201989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 366823189 + ... + 367153501.

It is an arithmetic number, because the mean of its divisors is an integer number (2422758059568).

Almost surely, 2^{121221021201985} is an apocalyptic number.

It is an amenable number.

121221021201985 is a deficient number, since it is larger than the sum of its proper divisors (33835494610367).

121221021201985 is a wasteful number, since it uses less digits than its factorization.

121221021201985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330802.

The product of its (nonzero) digits is 11520, while the sum is 37.

The spelling of 121221021201985 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, two hundred one thousand, nine hundred eighty-five".