1221033221 has 8 divisors (see below), whose sum is σ = 1244660544. Its totient is φ = 1197584640.

The previous prime is 1221033199. The next prime is 1221033277. The reversal of 1221033221 is 1223301221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221033221 - 2²⁶ = 1153924357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221033221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221033521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30851 + ... + 58256.

It is an arithmetic number, because the mean of its divisors is an integer number (155582568).

Almost surely, 2^1221033221 is an apocalyptic number.

It is an amenable number.

1221033221 is a deficient number, since it is larger than the sum of its proper divisors (23627323).

1221033221 is an equidigital number, since it uses as much as digits as its factorization.

1221033221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89371.

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

The square root of 1221033221 is about 34943.2857785298. The cubic root of 1221033221 is about 1068.8312918524.

Adding to 1221033221 its reverse (1223301221), we get a palindrome (2444334442).

The spelling of 1221033221 in words is "one billion, two hundred twenty-one million, thirty-three thousand, two hundred twenty-one".