1221328648324 has 12 divisors (see below), whose sum is σ = 2152926048924. Its totient is φ = 606206920064.

The previous prime is 1221328648313. The next prime is 1221328648357. The reversal of 1221328648324 is 4238468231221.

It can be written as a sum of positive squares in 2 ways, for example, as 469348308100 + 751980340224 = 685090^2 + 867168^2 .

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, 1114350409 + ... + 1114351504.

It is an arithmetic number, because the mean of its divisors is an integer number (179410504077).

Almost surely, 2^{1221328648324} is an apocalyptic number.

It is an amenable number.

1221328648324 is a deficient number, since it is larger than the sum of its proper divisors (931597400600).

1221328648324 is a wasteful number, since it uses less digits than its factorization.

1221328648324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2228702054 (or 2228702052 counting only the distinct ones).

The product of its digits is 884736, while the sum is 46.

The spelling of 1221328648324 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-eight million, six hundred forty-eight thousand, three hundred twenty-four".