1213312221321 has 4 divisors (see below), whose sum is σ = 1617749628432. Its totient is φ = 808874814212.

The previous prime is 1213312221301. The next prime is 1213312221349. The reversal of 1213312221321 is 1231222133121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1213312221321 - 2³⁷ = 1075873267849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213312221291 and 1213312221300.

It is not an unprimeable number, because it can be changed into a prime (1213312221301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202218703551 + ... + 202218703556.

It is an arithmetic number, because the mean of its divisors is an integer number (404437407108).

Almost surely, 2^{1213312221321} is an apocalyptic number.

It is an amenable number.

1213312221321 is a deficient number, since it is larger than the sum of its proper divisors (404437407111).

1213312221321 is an equidigital number, since it uses as much as digits as its factorization.

1213312221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404437407110.

The product of its digits is 864, while the sum is 24.

Adding to 1213312221321 its reverse (1231222133121), we get a palindrome (2444534354442).

The spelling of 1213312221321 in words is "one trillion, two hundred thirteen billion, three hundred twelve million, two hundred twenty-one thousand, three hundred twenty-one".