2021788234816 has 63 divisors (see below), whose sum is σ = 4667187968247. Its totient is φ = 866446546560.

The previous prime is 2021788234813. The next prime is 2021788234853. The reversal of 2021788234816 is 6184328871202.

The square root of 2021788234816 is 1421896.

It is a perfect power (a square), and thus also a powerful number.

It is not an unprimeable number, because it can be changed into a prime (2021788234813) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 79613481 + ... + 79638871.

Almost surely, 2^{2021788234816} is an apocalyptic number.

2021788234816 is the 1421896-th square number.

It is an amenable number.

2021788234816 is an abundant number, since it is smaller than the sum of its proper divisors (2645399733431).

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

2021788234816 is an frugal number, since it uses more digits than its factorization.

2021788234816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50808 (or 25400 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 52.

The spelling of 2021788234816 in words is "two trillion, twenty-one billion, seven hundred eighty-eight million, two hundred thirty-four thousand, eight hundred sixteen".