1221544224424 has 8 divisors (see below), whose sum is σ = 2290395420810. Its totient is φ = 610772112208.

The previous prime is 1221544224403. The next prime is 1221544224449. The reversal of 1221544224424 is 4244224451221.

It can be written as a sum of positive squares in only one way, i.e., 1221091300900 + 452923524 = 1105030^2 + 21282^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76346514019 + ... + 76346514034.

Almost surely, 2^{1221544224424} is an apocalyptic number.

It is an amenable number.

1221544224424 is a deficient number, since it is larger than the sum of its proper divisors (1068851196386).

1221544224424 is a wasteful number, since it uses less digits than its factorization.

1221544224424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152693028059 (or 152693028055 counting only the distinct ones).

The product of its digits is 163840, while the sum is 37.

Adding to 1221544224424 its reverse (4244224451221), we get a palindrome (5465768675645).

The spelling of 1221544224424 in words is "one trillion, two hundred twenty-one billion, five hundred forty-four million, two hundred twenty-four thousand, four hundred twenty-four".