1221331404044 has 48 divisors (see below), whose sum is σ = 2203556087040. Its totient is φ = 591965841600.

The previous prime is 1221331403977. The next prime is 1221331404049. The reversal of 1221331404044 is 4404041331221.

It is a junction number, because it is equal to n+sod(n) for n = 1221331403998 and 1221331404016.

It is not an unprimeable number, because it can be changed into a prime (1221331404049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28781747 + ... + 28824149.

It is an arithmetic number, because the mean of its divisors is an integer number (45907418480).

Almost surely, 2^{1221331404044} is an apocalyptic number.

It is an amenable number.

1221331404044 is a deficient number, since it is larger than the sum of its proper divisors (982224682996).

1221331404044 is a wasteful number, since it uses less digits than its factorization.

1221331404044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43710 (or 43708 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 1221331404044 its reverse (4404041331221), we get a palindrome (5625372735265).

The spelling of 1221331404044 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-one million, four hundred four thousand, forty-four".