121621224 has 16 divisors (see below), whose sum is σ = 304053120. Its totient is φ = 40540400.

The previous prime is 121621193. The next prime is 121621307. The reversal of 121621224 is 422126121.

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

It is a self number, because there is not a number n which added to its sum of digits gives 121621224.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2533752 + ... + 2533799.

It is an arithmetic number, because the mean of its divisors is an integer number (19003320).

Almost surely, 2^121621224 is an apocalyptic number.

It is an amenable number.

121621224 is an abundant number, since it is smaller than the sum of its proper divisors (182431896).

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

121621224 is a wasteful number, since it uses less digits than its factorization.

121621224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5067560 (or 5067556 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

The square root of 121621224 is about 11028.2013039298. The cubic root of 121621224 is about 495.4537539109.

Adding to 121621224 its reverse (422126121), we get a palindrome (543747345).

The spelling of 121621224 in words is "one hundred twenty-one million, six hundred twenty-one thousand, two hundred twenty-four".