121220011992 has 64 divisors (see below), whose sum is σ = 316317415680. Its totient is φ = 38638700672.

The previous prime is 121220011987. The next prime is 121220011999. The reversal of 121220011992 is 299110022121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220011999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1999843 + ... + 2059565.

It is an arithmetic number, because the mean of its divisors is an integer number (4942459620).

Almost surely, 2^121220011992 is an apocalyptic number.

121220011992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121220011992 is an abundant number, since it is smaller than the sum of its proper divisors (195097403688).

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

121220011992 is a wasteful number, since it uses less digits than its factorization.

121220011992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63432 (or 63428 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 30.

The spelling of 121220011992 in words is "one hundred twenty-one billion, two hundred twenty million, eleven thousand, nine hundred ninety-two".