1221403103 has 2 divisors, whose sum is σ = 1221403104. Its totient is φ = 1221403102.

The previous prime is 1221403081. The next prime is 1221403111. The reversal of 1221403103 is 3013041221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221403103 - 2¹² = 1221399007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221403133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610701551 + 610701552.

It is an arithmetic number, because the mean of its divisors is an integer number (610701552).

Almost surely, 2^1221403103 is an apocalyptic number.

1221403103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221403103 is an equidigital number, since it uses as much as digits as its factorization.

1221403103 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 1221403103 is about 34948.5779825160. The cubic root of 1221403103 is about 1068.9392063454.

Adding to 1221403103 its reverse (3013041221), we get a palindrome (4234444324).

The spelling of 1221403103 in words is "one billion, two hundred twenty-one million, four hundred three thousand, one hundred three".