1221003331 has 2 divisors, whose sum is σ = 1221003332. Its totient is φ = 1221003330.

The previous prime is 1221003319. The next prime is 1221003341. The reversal of 1221003331 is 1333001221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221003331 - 2²⁷ = 1086785603 is a prime.

It is a super-2 number, since 2×1221003331² = 2981698268626191122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221003341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610501665 + 610501666.

It is an arithmetic number, because the mean of its divisors is an integer number (610501666).

Almost surely, 2^1221003331 is an apocalyptic number.

1221003331 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221003331 is an equidigital number, since it uses as much as digits as its factorization.

1221003331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1221003331 is about 34942.8580828758. The cubic root of 1221003331 is about 1068.8225703786.

Adding to 1221003331 its reverse (1333001221), we get a palindrome (2554004552).

The spelling of 1221003331 in words is "one billion, two hundred twenty-one million, three thousand, three hundred thirty-one".