2019121328 has 20 divisors (see below), whose sum is σ = 4470911760. Its totient is φ = 865337664.

The previous prime is 2019121319. The next prime is 2019121333. The reversal of 2019121328 is 8231219102.

It is a self number, because there is not a number n which added to its sum of digits gives 2019121328.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9013823 + ... + 9014046.

It is an arithmetic number, because the mean of its divisors is an integer number (223545588).

Almost surely, 2^2019121328 is an apocalyptic number.

2019121328 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2019121328 is an abundant number, since it is smaller than the sum of its proper divisors (2451790432).

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

2019121328 is a wasteful number, since it uses less digits than its factorization.

2019121328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18027884 (or 18027878 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 2019121328 is about 44934.6339475465. The cubic root of 2019121328 is about 1263.9235486260.

The spelling of 2019121328 in words is "two billion, nineteen million, one hundred twenty-one thousand, three hundred twenty-eight".