1321225982180 has 72 divisors (see below), whose sum is σ = 3009112994664. Its totient is φ = 487075430400.

The previous prime is 1321225982113. The next prime is 1321225982227. The reversal of 1321225982180 is 812895221231.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 472870774336 + 848355207844 = 687656^2 + 921062^2 .

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, 1861670 + ... + 2471490.

It is an arithmetic number, because the mean of its divisors is an integer number (41793236037).

Almost surely, 2^{1321225982180} is an apocalyptic number.

1321225982180 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 1321225982180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1504556497332).

1321225982180 is an abundant number, since it is smaller than the sum of its proper divisors (1687887012484).

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

1321225982180 is a wasteful number, since it uses less digits than its factorization.

1321225982180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610497 (or 610482 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 1321225982180 in words is "one trillion, three hundred twenty-one billion, two hundred twenty-five million, nine hundred eighty-two thousand, one hundred eighty".