1321887120 has 160 divisors (see below), whose sum is σ = 4266393600. Its totient is φ = 338204160.

The previous prime is 1321887113. The next prime is 1321887137. The reversal of 1321887120 is 217881231.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 944181 + ... + 945579.

It is an arithmetic number, because the mean of its divisors is an integer number (26664960).

Almost surely, 2^1321887120 is an apocalyptic number.

1321887120 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 1321887120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2133196800).

1321887120 is an abundant number, since it is smaller than the sum of its proper divisors (2944506480).

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

1321887120 is a wasteful number, since it uses less digits than its factorization.

1321887120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573 (or 1567 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 1321887120 is about 36357.7656079138. The cubic root of 1321887120 is about 1097.4838134955.

The spelling of 1321887120 in words is "one billion, three hundred twenty-one million, eight hundred eighty-seven thousand, one hundred twenty".