1221030331 has 2 divisors, whose sum is σ = 1221030332. Its totient is φ = 1221030330.

The previous prime is 1221030329. The next prime is 1221030359. The reversal of 1221030331 is 1330301221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221030331 - 2¹ = 1221030329 is a prime.

It is a super-2 number, since 2×1221030331² = 2981830138443939122, which contains 22 as substring.

Together with 1221030329, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1221030431) 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 as a sum of consecutive naturals, namely, 610515165 + 610515166.

It is an arithmetic number, because the mean of its divisors is an integer number (610515166).

Almost surely, 2^1221030331 is an apocalyptic number.

1221030331 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221030331 is an equidigital number, since it uses as much as digits as its factorization.

1221030331 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 1221030331 is about 34943.2444257828. The cubic root of 1221030331 is about 1068.8304485981.

Adding to 1221030331 its reverse (1330301221), we get a palindrome (2551331552).

The spelling of 1221030331 in words is "one billion, two hundred twenty-one million, thirty thousand, three hundred thirty-one".