8126221784420 has 24 divisors (see below), whose sum is σ = 17067679755000. Its totient is φ = 3249990807552.

The previous prime is 8126221784419. The next prime is 8126221784449. The reversal of 8126221784420 is 244871226218.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1245085515556 + 6881136268864 = 1115834^2 + 2623192^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30985295 + ... + 31246454.

It is an arithmetic number, because the mean of its divisors is an integer number (711153323125).

Almost surely, 2^{8126221784420} is an apocalyptic number.

It is an amenable number.

8126221784420 is an abundant number, since it is smaller than the sum of its proper divisors (8941457970580).

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

8126221784420 is a wasteful number, since it uses less digits than its factorization.

8126221784420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62238287 (or 62238285 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 47.

The spelling of 8126221784420 in words is "eight trillion, one hundred twenty-six billion, two hundred twenty-one million, seven hundred eighty-four thousand, four hundred twenty".