1213001213321 has 4 divisors (see below), whose sum is σ = 1229617668372. Its totient is φ = 1196384758272.

The previous prime is 1213001213297. The next prime is 1213001213339. The reversal of 1213001213321 is 1233121003121.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1002811974025 + 210189239296 = 1001405^2 + 458464^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213001213321 - 2¹⁸ = 1213000951177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213001213293 and 1213001213302.

It is not an unprimeable number, because it can be changed into a prime (1213001213351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8308227416 + ... + 8308227561.

It is an arithmetic number, because the mean of its divisors is an integer number (307404417093).

Almost surely, 2^{1213001213321} is an apocalyptic number.

It is an amenable number.

1213001213321 is a deficient number, since it is larger than the sum of its proper divisors (16616455051).

1213001213321 is an equidigital number, since it uses as much as digits as its factorization.

1213001213321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16616455050.

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

Adding to 1213001213321 its reverse (1233121003121), we get a palindrome (2446122216442).

The spelling of 1213001213321 in words is "one trillion, two hundred thirteen billion, one million, two hundred thirteen thousand, three hundred twenty-one".