121856224 has 24 divisors (see below), whose sum is σ = 274177008. Its totient is φ = 52224000.

The previous prime is 121856213. The next prime is 121856227. The reversal of 121856224 is 422658121.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121856227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271777 + ... + 272224.

It is an arithmetic number, because the mean of its divisors is an integer number (11424042).

Almost surely, 2^121856224 is an apocalyptic number.

121856224 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

121856224 is an abundant number, since it is smaller than the sum of its proper divisors (152320784).

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

121856224 is an equidigital number, since it uses as much as digits as its factorization.

121856224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544018 (or 544010 counting only the distinct ones).

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

The square root of 121856224 is about 11038.8506648111. The cubic root of 121856224 is about 495.7726585612.

The spelling of 121856224 in words is "one hundred twenty-one million, eight hundred fifty-six thousand, two hundred twenty-four".