121377197808 has 60 divisors (see below), whose sum is σ = 345256248168. Its totient is φ = 39795799680.

The previous prime is 121377197807. The next prime is 121377197863. The reversal of 121377197808 is 808791773121.

121377197808 is a `hidden beast` number, since 1 + 2 + 1 + 377 + 197 + 80 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121377197807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6900210 + ... + 6917777.

Almost surely, 2^121377197808 is an apocalyptic number.

121377197808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

121377197808 is an abundant number, since it is smaller than the sum of its proper divisors (223879050360).

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

121377197808 is a wasteful number, since it uses less digits than its factorization.

121377197808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13818062 (or 13818053 counting only the distinct ones).

The product of its (nonzero) digits is 1185408, while the sum is 54.

The spelling of 121377197808 in words is "one hundred twenty-one billion, three hundred seventy-seven million, one hundred ninety-seven thousand, eight hundred eight".