99421544021 has 4 divisors (see below), whose sum is σ = 103744219872. Its totient is φ = 95098868172.

The previous prime is 99421543993. The next prime is 99421544039. The reversal of 99421544021 is 12044512499.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12044512499 = 101 ⋅119252599.

It is a cyclic number.

It is not a de Polignac number, because 99421544021 - 2⁶ = 99421543957 is a prime.

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 99421544021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99421544041) 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, 2161337891 + ... + 2161337936.

It is an arithmetic number, because the mean of its divisors is an integer number (25936054968).

Almost surely, 2^99421544021 is an apocalyptic number.

It is an amenable number.

99421544021 is a deficient number, since it is larger than the sum of its proper divisors (4322675851).

99421544021 is a wasteful number, since it uses less digits than its factorization.

99421544021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4322675850.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 99421544021 in words is "ninety-nine billion, four hundred twenty-one million, five hundred forty-four thousand, twenty-one".