1221444113524 has 12 divisors (see below), whose sum is σ = 2138580700900. Its totient is φ = 610421056128.

The previous prime is 1221444113501. The next prime is 1221444113611. The reversal of 1221444113524 is 4253114441221.

It can be written as a sum of positive squares in 2 ways, for example, as 939077283600 + 282366829924 = 969060^2 + 531382^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1221444113524.

It is a congruent number.

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, 75241029 + ... + 75257260.

Almost surely, 2^{1221444113524} is an apocalyptic number.

It is an amenable number.

1221444113524 is a deficient number, since it is larger than the sum of its proper divisors (917136587376).

1221444113524 is a wasteful number, since it uses less digits than its factorization.

1221444113524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150500322 (or 150500320 counting only the distinct ones).

The product of its digits is 30720, while the sum is 34.

Adding to 1221444113524 its reverse (4253114441221), we get a palindrome (5474558554745).

The spelling of 1221444113524 in words is "one trillion, two hundred twenty-one billion, four hundred forty-four million, one hundred thirteen thousand, five hundred twenty-four".