99821918472 has 64 divisors (see below), whose sum is σ = 255668736960. Its totient is φ = 32465721600.

The previous prime is 99821918467. The next prime is 99821918551. The reversal of 99821918472 is 27481912899.

It is a happy number.

It is a super-2 number, since 2×99821918472² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 13447 + ... + 447017.

It is an arithmetic number, because the mean of its divisors is an integer number (3994824015).

Almost surely, 2^99821918472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99821918472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127834368480).

99821918472 is an abundant number, since it is smaller than the sum of its proper divisors (155846818488).

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

99821918472 is a wasteful number, since it uses less digits than its factorization.

99821918472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433814 (or 433810 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 60.

The spelling of 99821918472 in words is "ninety-nine billion, eight hundred twenty-one million, nine hundred eighteen thousand, four hundred seventy-two".