1321122044000 has 144 divisors (see below), whose sum is σ = 3567915213408. Its totient is φ = 480407840000.

The previous prime is 1321122043963. The next prime is 1321122044017. The reversal of 1321122044000 is 4402211231.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 880796 + ... + 1848795.

It is an arithmetic number, because the mean of its divisors is an integer number (24777188982).

Almost surely, 2^{1321122044000} is an apocalyptic number.

1321122044000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321122044000 is an abundant number, since it is smaller than the sum of its proper divisors (2246793169408).

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

1321122044000 is a wasteful number, since it uses less digits than its factorization.

1321122044000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2729638 (or 2729609 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 1321122044000 its reverse (4402211231), we get a palindrome (1325524255231).

The spelling of 1321122044000 in words is "one trillion, three hundred twenty-one billion, one hundred twenty-two million, forty-four thousand".