1221444444041 has 4 divisors (see below), whose sum is σ = 1221542952084. Its totient is φ = 1221345936000.

The previous prime is 1221444443917. The next prime is 1221444444107. The reversal of 1221444444041 is 1404444441221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 318191887225 + 903252556816 = 564085^2 + 950396^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221444444041 - 2¹⁰ = 1221444443017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221444443992 and 1221444444010.

It is not an unprimeable number, because it can be changed into a prime (1221444444841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49235420 + ... + 49260221.

It is an arithmetic number, because the mean of its divisors is an integer number (305385738021).

Almost surely, 2^{1221444444041} is an apocalyptic number.

It is an amenable number.

1221444444041 is a deficient number, since it is larger than the sum of its proper divisors (98508043).

1221444444041 is an equidigital number, since it uses as much as digits as its factorization.

1221444444041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98508042.

The product of its (nonzero) digits is 65536, while the sum is 35.

Adding to 1221444444041 its reverse (1404444441221), we get a palindrome (2625888885262).

The spelling of 1221444444041 in words is "one trillion, two hundred twenty-one billion, four hundred forty-four million, four hundred forty-four thousand, forty-one".