121561224 has 64 divisors (see below), whose sum is σ = 311739840. Its totient is φ = 39486720.

The previous prime is 121561211. The next prime is 121561241. The reversal of 121561224 is 422165121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 121561194 and 121561203.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 288534 + ... + 288954.

It is an arithmetic number, because the mean of its divisors is an integer number (4870935).

Almost surely, 2^121561224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121561224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155869920).

121561224 is an abundant number, since it is smaller than the sum of its proper divisors (190178616).

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

121561224 is a wasteful number, since it uses less digits than its factorization.

121561224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710 (or 706 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The square root of 121561224 is about 11025.4806697939. The cubic root of 121561224 is about 495.3722656254.

The spelling of 121561224 in words is "one hundred twenty-one million, five hundred sixty-one thousand, two hundred twenty-four".