99821918471 has 32 divisors (see below), whose sum is σ = 111203124480. Its totient is φ = 88850764800.

The previous prime is 99821918467. The next prime is 99821918551. The reversal of 99821918471 is 17481912899.

It is a cyclic number.

It is not a de Polignac number, because 99821918471 - 2² = 99821918467 is a prime.

It is a super-3 number, since 3×99821918471³ (a number of 34 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99821918471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99821918431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40298285 + ... + 40300761.

It is an arithmetic number, because the mean of its divisors is an integer number (3475097640).

Almost surely, 2^99821918471 is an apocalyptic number.

99821918471 is a deficient number, since it is larger than the sum of its proper divisors (11381206009).

99821918471 is a wasteful number, since it uses less digits than its factorization.

99821918471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2975.

The product of its digits is 2612736, while the sum is 59.

The spelling of 99821918471 in words is "ninety-nine billion, eight hundred twenty-one million, nine hundred eighteen thousand, four hundred seventy-one".