121221424 has 40 divisors (see below), whose sum is σ = 252224928. Its totient is φ = 56232960.

The previous prime is 121221403. The next prime is 121221449. The reversal of 121221424 is 424122121.

It is a nude number because it is divisible by every one of its digits.

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 7 ways as a sum of consecutive naturals, for example, 16174 + ... + 22450.

Almost surely, 2^121221424 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 121221424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126112464).

121221424 is an abundant number, since it is smaller than the sum of its proper divisors (131003504).

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

121221424 is a wasteful number, since it uses less digits than its factorization.

121221424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6373 (or 6367 counting only the distinct ones).

The product of its digits is 256, while the sum is 19.

The square root of 121221424 is about 11010.0601269929. The cubic root of 121221424 is about 494.9102636365.

Adding to 121221424 its reverse (424122121), we get a palindrome (545343545).

The spelling of 121221424 in words is "one hundred twenty-one million, two hundred twenty-one thousand, four hundred twenty-four".