221121332 has 6 divisors (see below), whose sum is σ = 386962338. Its totient is φ = 110560664.

The previous prime is 221121293. The next prime is 221121343. The reversal of 221121332 is 233121122.

It can be written as a sum of positive squares in only one way, i.e., 210714256 + 10407076 = 14516^2 + 3226^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221121332.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 27640163 + ... + 27640170.

It is an arithmetic number, because the mean of its divisors is an integer number (64493723).

Almost surely, 2^221121332 is an apocalyptic number.

It is an amenable number.

221121332 is a deficient number, since it is larger than the sum of its proper divisors (165841006).

221121332 is a wasteful number, since it uses less digits than its factorization.

221121332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55280337 (or 55280335 counting only the distinct ones).

The product of its digits is 144, while the sum is 17.

The square root of 221121332 is about 14870.1490241356. The cubic root of 221121332 is about 604.7049828627.

Adding to 221121332 its reverse (233121122), we get a palindrome (454242454).

The spelling of 221121332 in words is "two hundred twenty-one million, one hundred twenty-one thousand, three hundred thirty-two".