1221033312113 has 8 divisors (see below), whose sum is σ = 1240144741800. Its totient is φ = 1202041703808.

The previous prime is 1221033312049. The next prime is 1221033312137. The reversal of 1221033312113 is 3112133301221.

It can be written as a sum of positive squares in 4 ways, for example, as 145048245904 + 1075985066209 = 380852^2 + 1037297^2 .

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 1221033312113 - 2⁶ = 1221033312049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221033312713) 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, 29934806 + ... + 29975567.

It is an arithmetic number, because the mean of its divisors is an integer number (155018092725).

Almost surely, 2^{1221033312113} is an apocalyptic number.

It is an amenable number.

1221033312113 is a deficient number, since it is larger than the sum of its proper divisors (19111429687).

1221033312113 is an equidigital number, since it uses as much as digits as its factorization.

1221033312113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59910691.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1221033312113 its reverse (3112133301221), we get a palindrome (4333166613334).

The spelling of 1221033312113 in words is "one trillion, two hundred twenty-one billion, thirty-three million, three hundred twelve thousand, one hundred thirteen".