8221011821730 has 48 divisors (see below), whose sum is σ = 22631961960504. Its totient is φ = 2063312770560.

The previous prime is 8221011821707. The next prime is 8221011821761. The reversal of 8221011821730 is 371281101228.

It can be written as a sum of positive squares in 4 ways, for example, as 8219763542169 + 1248279561 = 2867013^2 + 35331^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2686603641 + ... + 2686606700.

Almost surely, 2^{8221011821730} is an apocalyptic number.

8221011821730 is an abundant number, since it is smaller than the sum of its proper divisors (14410950138774).

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

8221011821730 is a wasteful number, since it uses less digits than its factorization.

8221011821730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5373210371 (or 5373210368 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

Adding to 8221011821730 its reverse (371281101228), we get a palindrome (8592292922958).

The spelling of 8221011821730 in words is "eight trillion, two hundred twenty-one billion, eleven million, eight hundred twenty-one thousand, seven hundred thirty".