1221403303 has 2 divisors, whose sum is σ = 1221403304. Its totient is φ = 1221403302.

The previous prime is 1221403291. The next prime is 1221403307. The reversal of 1221403303 is 3033041221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221403303 - 2¹³ = 1221395111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221403307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610701651 + 610701652.

It is an arithmetic number, because the mean of its divisors is an integer number (610701652).

Almost surely, 2^1221403303 is an apocalyptic number.

1221403303 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221403303 is an equidigital number, since it uses as much as digits as its factorization.

1221403303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1221403303 is about 34948.5808438626. The cubic root of 1221403303 is about 1068.9392646903.

Adding to 1221403303 its reverse (3033041221), we get a palindrome (4254444524).

The spelling of 1221403303 in words is "one billion, two hundred twenty-one million, four hundred three thousand, three hundred three".