1321120224 has 72 divisors (see below), whose sum is σ = 3858505560. Its totient is φ = 428467968.

The previous prime is 1321120223. The next prime is 1321120243. The reversal of 1321120224 is 4220211231.

It is a happy number.

1321120224 is a `hidden beast` number, since 1 + 321 + 120 + 224 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1321120197 and 1321120206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321120223) 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 11 ways as a sum of consecutive naturals, for example, 51334 + ... + 72645.

It is an arithmetic number, because the mean of its divisors is an integer number (53590355).

Almost surely, 2^1321120224 is an apocalyptic number.

It is an amenable number.

1321120224 is an abundant number, since it is smaller than the sum of its proper divisors (2537385336).

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

1321120224 is a wasteful number, since it uses less digits than its factorization.

1321120224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124032 (or 124021 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1321120224 is about 36347.2175551307. The cubic root of 1321120224 is about 1097.2715364789.

Adding to 1321120224 its reverse (4220211231), we get a palindrome (5541331455).

The spelling of 1321120224 in words is "one billion, three hundred twenty-one million, one hundred twenty thousand, two hundred twenty-four".