99942821794 has 16 divisors (see below), whose sum is σ = 156443040000. Its totient is φ = 47795441760.

The previous prime is 99942821791. The next prime is 99942821819. The reversal of 99942821794 is 49712824999.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (99942821791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 680599 + ... + 814309.

It is an arithmetic number, because the mean of its divisors is an integer number (9777690000).

Almost surely, 2^99942821794 is an apocalyptic number.

99942821794 is a deficient number, since it is larger than the sum of its proper divisors (56500218206).

99942821794 is a wasteful number, since it uses less digits than its factorization.

99942821794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149985.

The product of its digits is 23514624, while the sum is 64.

The spelling of 99942821794 in words is "ninety-nine billion, nine hundred forty-two million, eight hundred twenty-one thousand, seven hundred ninety-four".