121363897866138 has 24 divisors (see below), whose sum is σ = 276794854783200. Its totient is φ = 38325441431304.

The previous prime is 121363897866091. The next prime is 121363897866161. The reversal of 121363897866138 is 831668798363121.

It is a happy number.

121363897866138 is a `hidden beast` number, since 1 + 2 + 1 + 36 + 389 + 7 + 86 + 6 + 138 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 177432598878 + ... + 177432599561.

It is an arithmetic number, because the mean of its divisors is an integer number (11533118949300).

Almost surely, 2^{121363897866138} is an apocalyptic number.

121363897866138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121363897866138 is an abundant number, since it is smaller than the sum of its proper divisors (155430956917062).

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

121363897866138 is a wasteful number, since it uses less digits than its factorization.

121363897866138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354865198466 (or 354865198463 counting only the distinct ones).

The product of its digits is 376233984, while the sum is 72.

The spelling of 121363897866138 in words is "one hundred twenty-one trillion, three hundred sixty-three billion, eight hundred ninety-seven million, eight hundred sixty-six thousand, one hundred thirty-eight".