121981005312 has 40 divisors (see below), whose sum is σ = 324965026056. Its totient is φ = 40660334592.

The previous prime is 121981005259. The next prime is 121981005313. The reversal of 121981005312 is 213500189121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121981005313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39705823 + ... + 39708894.

Almost surely, 2^121981005312 is an apocalyptic number.

121981005312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121981005312 is an abundant number, since it is smaller than the sum of its proper divisors (202984020744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121981005312 is an frugal number, since it uses more digits than its factorization.

121981005312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79414738 (or 79414722 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 33.

The spelling of 121981005312 in words is "one hundred twenty-one billion, nine hundred eighty-one million, five thousand, three hundred twelve".