99534576221 has 4 divisors (see below), whose sum is σ = 99578954112. Its totient is φ = 99490198332.

The previous prime is 99534576217. The next prime is 99534576257. The reversal of 99534576221 is 12267543599.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 99534576221 - 2² = 99534576217 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 (99534576121) 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, 22185581 + ... + 22190066.

It is an arithmetic number, because the mean of its divisors is an integer number (24894738528).

Almost surely, 2^99534576221 is an apocalyptic number.

It is an amenable number.

99534576221 is a deficient number, since it is larger than the sum of its proper divisors (44377891).

99534576221 is a wasteful number, since it uses less digits than its factorization.

99534576221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44377890.

The product of its digits is 4082400, while the sum is 53.

The spelling of 99534576221 in words is "ninety-nine billion, five hundred thirty-four million, five hundred seventy-six thousand, two hundred twenty-one".