121856242 has 8 divisors (see below), whose sum is σ = 186673536. Its totient is φ = 59631732.

The previous prime is 121856239. The next prime is 121856243. The reversal of 121856242 is 242658121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (121856243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 648078 + ... + 648265.

It is an arithmetic number, because the mean of its divisors is an integer number (23334192).

Almost surely, 2^121856242 is an apocalyptic number.

121856242 is a deficient number, since it is larger than the sum of its proper divisors (64817294).

121856242 is a wasteful number, since it uses less digits than its factorization.

121856242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296392.

The product of its digits is 7680, while the sum is 31.

The square root of 121856242 is about 11038.8514801133. The cubic root of 121856242 is about 495.7726829722.

The spelling of 121856242 in words is "one hundred twenty-one million, eight hundred fifty-six thousand, two hundred forty-two".