1321944120 has 192 divisors, whose sum is σ = 5079672000. Its totient is φ = 291723264.

The previous prime is 1321944109. The next prime is 1321944131. The reversal of 1321944120 is 214491231.

It is a happy number.

1321944120 is a `hidden beast` number, since 1 + 3 + 219 + 441 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1321944109) and next prime (1321944131).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64036 + ... + 82124.

It is an arithmetic number, because the mean of its divisors is an integer number (26456625).

Almost surely, 2^1321944120 is an apocalyptic number.

1321944120 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 1321944120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2539836000).

1321944120 is an abundant number, since it is smaller than the sum of its proper divisors (3757727880).

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

1321944120 is a wasteful number, since it uses less digits than its factorization.

1321944120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18142 (or 18135 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1321944120 is about 36358.5494760173. The cubic root of 1321944120 is about 1097.4995878323.

The spelling of 1321944120 in words is "one billion, three hundred twenty-one million, nine hundred forty-four thousand, one hundred twenty".