1221011303 has 2 divisors, whose sum is σ = 1221011304. Its totient is φ = 1221011302.

The previous prime is 1221011293. The next prime is 1221011357. The reversal of 1221011303 is 3031101221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221011303 - 2⁸ = 1221011047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221011503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610505651 + 610505652.

It is an arithmetic number, because the mean of its divisors is an integer number (610505652).

Almost surely, 2^1221011303 is an apocalyptic number.

1221011303 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221011303 is an equidigital number, since it uses as much as digits as its factorization.

1221011303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1221011303 is about 34942.9721546408. The cubic root of 1221011303 is about 1068.8248965079.

Adding to 1221011303 its reverse (3031101221), we get a palindrome (4252112524).

The spelling of 1221011303 in words is "one billion, two hundred twenty-one million, eleven thousand, three hundred three".