1221443550441 has 24 divisors (see below), whose sum is σ = 1784165512896. Its totient is φ = 805154617440.

The previous prime is 1221443550427. The next prime is 1221443550449. The reversal of 1221443550441 is 1440553441221.

1221443550441 is a `hidden beast` number, since 1 + 2 + 2 + 144 + 3 + 5 + 504 + 4 + 1 = 666.

It is not a de Polignac number, because 1221443550441 - 2¹⁵ = 1221443517673 is a prime.

It is a super-2 number, since 2×1221443550441² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221443550396 and 1221443550405.

It is not an unprimeable number, because it can be changed into a prime (1221443550449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 403575 + ... + 1614236.

It is an arithmetic number, because the mean of its divisors is an integer number (74340229704).

Almost surely, 2^{1221443550441} is an apocalyptic number.

It is an amenable number.

1221443550441 is a deficient number, since it is larger than the sum of its proper divisors (562721962455).

1221443550441 is a wasteful number, since it uses less digits than its factorization.

1221443550441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2018573 (or 2018570 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

Adding to 1221443550441 its reverse (1440553441221), we get a palindrome (2661996991662).

The spelling of 1221443550441 in words is "one trillion, two hundred twenty-one billion, four hundred forty-three million, five hundred fifty thousand, four hundred forty-one".