1221212303 has 2 divisors, whose sum is σ = 1221212304. Its totient is φ = 1221212302.

The previous prime is 1221212299. The next prime is 1221212329. The reversal of 1221212303 is 3032121221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221212303 - 2² = 1221212299 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221212903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610606151 + 610606152.

It is an arithmetic number, because the mean of its divisors is an integer number (610606152).

Almost surely, 2^1221212303 is an apocalyptic number.

1221212303 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221212303 is an equidigital number, since it uses as much as digits as its factorization.

1221212303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1221212303 is about 34945.8481511037. The cubic root of 1221212303 is about 1068.8835424342.

Adding to 1221212303 its reverse (3032121221), we get a palindrome (4253333524).

The spelling of 1221212303 in words is "one billion, two hundred twenty-one million, two hundred twelve thousand, three hundred three".