1221304033 has 2 divisors, whose sum is σ = 1221304034. Its totient is φ = 1221304032.

The previous prime is 1221303973. The next prime is 1221304037. The reversal of 1221304033 is 3304031221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1207076049 + 14227984 = 34743^2 + 3772^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221304033 - 2²¹ = 1219206881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221304033.

It is not a weakly prime, because it can be changed into another prime (1221304037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610652016 + 610652017.

It is an arithmetic number, because the mean of its divisors is an integer number (610652017).

Almost surely, 2^1221304033 is an apocalyptic number.

It is an amenable number.

1221304033 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221304033 is an equidigital number, since it uses as much as digits as its factorization.

1221304033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1221304033 is about 34947.1605856613. The cubic root of 1221304033 is about 1068.9103044292.

Adding to 1221304033 its reverse (3304031221), we get a palindrome (4525335254).

The spelling of 1221304033 in words is "one billion, two hundred twenty-one million, three hundred four thousand, thirty-three".