1221313310344 has 16 divisors (see below), whose sum is σ = 2424666131100. Its totient is φ = 574735675392.

The previous prime is 1221313310317. The next prime is 1221313310447. The reversal of 1221313310344 is 4430133131221.

It can be written as a sum of positive squares in 2 ways, for example, as 1196989164900 + 24324145444 = 1094070^2 + 155962^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4490122329 + ... + 4490122600.

Almost surely, 2^{1221313310344} is an apocalyptic number.

It is an amenable number.

1221313310344 is a deficient number, since it is larger than the sum of its proper divisors (1203352820756).

1221313310344 is a wasteful number, since it uses less digits than its factorization.

1221313310344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8980244952 (or 8980244948 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 1221313310344 its reverse (4430133131221), we get a palindrome (5651446441565).

The spelling of 1221313310344 in words is "one trillion, two hundred twenty-one billion, three hundred thirteen million, three hundred ten thousand, three hundred forty-four".