1221033321 has 6 divisors (see below), whose sum is σ = 1763714810. Its totient is φ = 814022208.

The previous prime is 1221033293. The next prime is 1221033349. The reversal of 1221033321 is 1233301221.

It is an interprime number because it is at equal distance from previous prime (1221033293) and next prime (1221033349).

It can be written as a sum of positive squares in only one way, i.e., 1076168025 + 144865296 = 32805^2 + 12036^2 .

It is not a de Polignac number, because 1221033321 - 2⁷ = 1221033193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221033294 and 1221033303.

It is not an unprimeable number, because it can be changed into a prime (1221033391) 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 5 ways as a sum of consecutive naturals, for example, 67835176 + ... + 67835193.

Almost surely, 2^1221033321 is an apocalyptic number.

It is an amenable number.

1221033321 is a deficient number, since it is larger than the sum of its proper divisors (542681489).

1221033321 is a wasteful number, since it uses less digits than its factorization.

1221033321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135670375 (or 135670372 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1221033321 is about 34943.2872094198. The cubic root of 1221033321 is about 1068.8313210308.

Adding to 1221033321 its reverse (1233301221), we get a palindrome (2454334542).

The spelling of 1221033321 in words is "one billion, two hundred twenty-one million, thirty-three thousand, three hundred twenty-one".