1221224706664 has 16 divisors (see below), whose sum is σ = 2290336053120. Its totient is φ = 610468425840.

The previous prime is 1221224706623. The next prime is 1221224706719. The reversal of 1221224706664 is 4666074221221.

It is a super-4 number, since 4×1221224706664⁴ (a number of 49 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221224706664.

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, 17954872 + ... + 18022759.

It is an arithmetic number, because the mean of its divisors is an integer number (143146003320).

Almost surely, 2^{1221224706664} is an apocalyptic number.

It is an amenable number.

1221224706664 is a deficient number, since it is larger than the sum of its proper divisors (1069111346456).

1221224706664 is a wasteful number, since it uses less digits than its factorization.

1221224706664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35981880 (or 35981876 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 43.

Adding to 1221224706664 its reverse (4666074221221), we get a palindrome (5887298927885).

The spelling of 1221224706664 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-four million, seven hundred six thousand, six hundred sixty-four".