1321127040000 has 220 divisors, whose sum is σ = 4400204408864. Its totient is φ = 352300032000.

The previous prime is 1321127039987. The next prime is 1321127040007. The reversal of 1321127040000 is 407211231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321127040007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1575957 + ... + 2264043.

Almost surely, 2^{1321127040000} is an apocalyptic number.

1321127040000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321127040000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2200102204432).

1321127040000 is an abundant number, since it is smaller than the sum of its proper divisors (3079077368864).

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

1321127040000 is an frugal number, since it uses more digits than its factorization.

1321127040000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688130 (or 688097 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The spelling of 1321127040000 in words is "one trillion, three hundred twenty-one billion, one hundred twenty-seven million, forty thousand".