121351878 has 16 divisors (see below), whose sum is σ = 269670960. Its totient is φ = 40450608.

The previous prime is 121351873. The next prime is 121351883. The reversal of 121351878 is 878153121.

It is an interprime number because it is at equal distance from previous prime (121351873) and next prime (121351883).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121351871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1123575 + ... + 1123682.

It is an arithmetic number, because the mean of its divisors is an integer number (16854435).

Almost surely, 2^121351878 is an apocalyptic number.

121351878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121351878 is an abundant number, since it is smaller than the sum of its proper divisors (148319082).

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

121351878 is a wasteful number, since it uses less digits than its factorization.

121351878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2247268 (or 2247262 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 121351878 is about 11015.9828431239. The cubic root of 121351878 is about 495.0877346784.

The spelling of 121351878 in words is "one hundred twenty-one million, three hundred fifty-one thousand, eight hundred seventy-eight".