2021728530 has 16 divisors (see below), whose sum is σ = 4852148544. Its totient is φ = 539127600.

The previous prime is 2021728477. The next prime is 2021728531. The reversal of 2021728530 is 358271202.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 67390951 = 2021728530 / (2 + 0 + 2 + 1 + 7 + 2 + 8 + 5 + 3 + 0).

It is not an unprimeable number, because it can be changed into a prime (2021728531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33695446 + ... + 33695505.

It is an arithmetic number, because the mean of its divisors is an integer number (303259284).

Almost surely, 2^2021728530 is an apocalyptic number.

2021728530 is an abundant number, since it is smaller than the sum of its proper divisors (2830420014).

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

2021728530 is a wasteful number, since it uses less digits than its factorization.

2021728530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67390961.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 2021728530 is about 44963.6356403705. The cubic root of 2021728530 is about 1264.4673308173.

Adding to 2021728530 its reverse (358271202), we get a palindrome (2379999732).

The spelling of 2021728530 in words is "two billion, twenty-one million, seven hundred twenty-eight thousand, five hundred thirty".