1221313303213 has 16 divisors (see below), whose sum is σ = 1240819646976. Its totient is φ = 1201924010160.

The previous prime is 1221313303211. The next prime is 1221313303229. The reversal of 1221313303213 is 3123033131221.

It is a cyclic number.

It is not a de Polignac number, because 1221313303213 - 2¹ = 1221313303211 is a prime.

It is a super-2 number, since 2×1221313303213² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221313303211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86690856 + ... + 86704942.

It is an arithmetic number, because the mean of its divisors is an integer number (77551227936).

Almost surely, 2^{1221313303213} is an apocalyptic number.

It is an amenable number.

1221313303213 is a deficient number, since it is larger than the sum of its proper divisors (19506343763).

1221313303213 is a wasteful number, since it uses less digits than its factorization.

1221313303213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18144.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 1221313303213 its reverse (3123033131221), we get a palindrome (4344346434434).

The spelling of 1221313303213 in words is "one trillion, two hundred twenty-one billion, three hundred thirteen million, three hundred three thousand, two hundred thirteen".