1221241303103 has 4 divisors (see below), whose sum is σ = 1274338751088. Its totient is φ = 1168143855120.

The previous prime is 1221241303097. The next prime is 1221241303129. The reversal of 1221241303103 is 3013031421221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221241303103 - 2¹⁴ = 1221241286719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 53097447961 = 1221241303103 / (1 + 2 + 2 + 1 + 2 + 4 + 1 + 3 + 0 + 3 + 1 + 0 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221241303003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26548723958 + ... + 26548724003.

It is an arithmetic number, because the mean of its divisors is an integer number (318584687772).

Almost surely, 2^{1221241303103} is an apocalyptic number.

1221241303103 is a deficient number, since it is larger than the sum of its proper divisors (53097447985).

1221241303103 is an equidigital number, since it uses as much as digits as its factorization.

1221241303103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53097447984.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1221241303103 its reverse (3013031421221), we get a palindrome (4234272724324).

The spelling of 1221241303103 in words is "one trillion, two hundred twenty-one billion, two hundred forty-one million, three hundred three thousand, one hundred three".