1221311023103 has 8 divisors (see below), whose sum is σ = 1222874239440. Its totient is φ = 1219748362560.

The previous prime is 1221311023001. The next prime is 1221311023123. The reversal of 1221311023103 is 3013201131221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221311023103 - 2²⁶ = 1221243914239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221311023123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4351208 + ... + 4623378.

It is an arithmetic number, because the mean of its divisors is an integer number (152859279930).

Almost surely, 2^{1221311023103} is an apocalyptic number.

1221311023103 is a deficient number, since it is larger than the sum of its proper divisors (1563216337).

1221311023103 is an equidigital number, since it uses as much as digits as its factorization.

1221311023103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277897.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1221311023103 its reverse (3013201131221), we get a palindrome (4234512154324).

The spelling of 1221311023103 in words is "one trillion, two hundred twenty-one billion, three hundred eleven million, twenty-three thousand, one hundred three".