1221103313013 has 8 divisors (see below), whose sum is σ = 1643944913728. Its totient is φ = 806165293824.

The previous prime is 1221103313011. The next prime is 1221103313083. The reversal of 1221103313013 is 3103133011221.

It is a happy number.

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

It is not a de Polignac number, because 1221103313013 - 2¹ = 1221103313011 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 (1221103313011) 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, 1975895020 + ... + 1975895637.

It is an arithmetic number, because the mean of its divisors is an integer number (205493114216).

Almost surely, 2^{1221103313013} is an apocalyptic number.

It is an amenable number.

1221103313013 is a deficient number, since it is larger than the sum of its proper divisors (422841600715).

1221103313013 is a wasteful number, since it uses less digits than its factorization.

1221103313013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3951790763.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 1221103313013 its reverse (3103133011221), we get a palindrome (4324236324234).

The spelling of 1221103313013 in words is "one trillion, two hundred twenty-one billion, one hundred three million, three hundred thirteen thousand, thirteen".