1221544343312 has 20 divisors (see below), whose sum is σ = 2421782682000. Its totient is φ = 596568167328.

The previous prime is 1221544343309. The next prime is 1221544343351. The reversal of 1221544343312 is 2133434451221.

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, 887749562 + ... + 887750937.

It is an arithmetic number, because the mean of its divisors is an integer number (121089134100).

Almost surely, 2^{1221544343312} is an apocalyptic number.

It is an amenable number.

1221544343312 is a deficient number, since it is larger than the sum of its proper divisors (1200238338688).

1221544343312 is a wasteful number, since it uses less digits than its factorization.

1221544343312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775500550 (or 1775500544 counting only the distinct ones).

The product of its digits is 69120, while the sum is 35.

Adding to 1221544343312 its reverse (2133434451221), we get a palindrome (3354978794533).

The spelling of 1221544343312 in words is "one trillion, two hundred twenty-one billion, five hundred forty-four million, three hundred forty-three thousand, three hundred twelve".