99798421888 has 48 divisors (see below), whose sum is σ = 216917221860. Its totient is φ = 45357530880.

The previous prime is 99798421871. The next prime is 99798421889. The reversal of 99798421888 is 88812489799.

It is a super-2 number, since 2×99798421888² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 99798421888.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99798421889) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11849743 + ... + 11858161.

Almost surely, 2^99798421888 is an apocalyptic number.

It is an amenable number.

99798421888 is an abundant number, since it is smaller than the sum of its proper divisors (117118799972).

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

99798421888 is an frugal number, since it uses more digits than its factorization.

99798421888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16863 (or 8432 counting only the distinct ones).

The product of its digits is 167215104, while the sum is 73.

The spelling of 99798421888 in words is "ninety-nine billion, seven hundred ninety-eight million, four hundred twenty-one thousand, eight hundred eighty-eight".