1321231321044 has 24 divisors (see below), whose sum is σ = 3425414536320. Its totient is φ = 440410440312.

The previous prime is 1321231321043. The next prime is 1321231321049. The reversal of 1321231321044 is 4401231321231.

1321231321044 is a `hidden beast` number, since 1 + 321 + 2 + 313 + 21 + 0 + 4 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1321231320999 and 1321231321017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321231321043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6116811564 + ... + 6116811779.

It is an arithmetic number, because the mean of its divisors is an integer number (142725605680).

Almost surely, 2^{1321231321044} is an apocalyptic number.

It is an amenable number.

1321231321044 is an abundant number, since it is smaller than the sum of its proper divisors (2104183215276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321231321044 is a wasteful number, since it uses less digits than its factorization.

1321231321044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12233623356 (or 12233623348 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 1321231321044 its reverse (4401231321231), we get a palindrome (5722462642275).

The spelling of 1321231321044 in words is "one trillion, three hundred twenty-one billion, two hundred thirty-one million, three hundred twenty-one thousand, forty-four".