121777993812 has 12 divisors (see below), whose sum is σ = 284148652256. Its totient is φ = 40592664600.

The previous prime is 121777993801. The next prime is 121777993823. The reversal of 121777993812 is 218399777121.

121777993812 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (121777993801) and next prime (121777993823).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5074083064 + ... + 5074083087.

Almost surely, 2^121777993812 is an apocalyptic number.

121777993812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121777993812 is an abundant number, since it is smaller than the sum of its proper divisors (162370658444).

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

121777993812 is a wasteful number, since it uses less digits than its factorization.

121777993812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10148166158 (or 10148166156 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 57.

The spelling of 121777993812 in words is "one hundred twenty-one billion, seven hundred seventy-seven million, nine hundred ninety-three thousand, eight hundred twelve".