1221116033 has 2 divisors, whose sum is σ = 1221116034. Its totient is φ = 1221116032.

The previous prime is 1221115999. The next prime is 1221116051. The reversal of 1221116033 is 3306111221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 950612224 + 270503809 = 30832^2 + 16447^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221116033 - 2⁶ = 1221115969 is a prime.

It is a super-2 number, since 2×1221116033² = 2982248732099314178, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221115996 and 1221116014.

It is not a weakly prime, because it can be changed into another prime (1221116053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610558016 + 610558017.

It is an arithmetic number, because the mean of its divisors is an integer number (610558017).

Almost surely, 2^1221116033 is an apocalyptic number.

It is an amenable number.

1221116033 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221116033 is an equidigital number, since it uses as much as digits as its factorization.

1221116033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1221116033 is about 34944.4707071090. The cubic root of 1221116033 is about 1068.8554544645.

Adding to 1221116033 its reverse (3306111221), we get a palindrome (4527227254).

The spelling of 1221116033 in words is "one billion, two hundred twenty-one million, one hundred sixteen thousand, thirty-three".