99421084871 has 4 divisors (see below), whose sum is σ = 99438036552. Its totient is φ = 99404133192.

The previous prime is 99421084831. The next prime is 99421084891. The reversal of 99421084871 is 17848012499.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17848012499 = 76003 ⋅234833.

It is a cyclic number.

It is not a de Polignac number, because 99421084871 - 2¹⁸ = 99420822727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99421084811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8467040 + ... + 8478773.

It is an arithmetic number, because the mean of its divisors is an integer number (24859509138).

Almost surely, 2^99421084871 is an apocalyptic number.

99421084871 is a deficient number, since it is larger than the sum of its proper divisors (16951681).

99421084871 is a wasteful number, since it uses less digits than its factorization.

99421084871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16951680.

The product of its (nonzero) digits is 1161216, while the sum is 53.

The spelling of 99421084871 in words is "ninety-nine billion, four hundred twenty-one million, eighty-four thousand, eight hundred seventy-one".