99535766221 has 4 divisors (see below), whose sum is σ = 99536446944. Its totient is φ = 99535085500.

The previous prime is 99535766159. The next prime is 99535766233. The reversal of 99535766221 is 12266753599.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 99535766221 - 2⁷ = 99535766093 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 (99535766251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21385 + ... + 446686.

It is an arithmetic number, because the mean of its divisors is an integer number (24884111736).

Almost surely, 2^99535766221 is an apocalyptic number.

It is an amenable number.

99535766221 is a deficient number, since it is larger than the sum of its proper divisors (680723).

99535766221 is a wasteful number, since it uses less digits than its factorization.

99535766221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680722.

The product of its digits is 6123600, while the sum is 55.

The spelling of 99535766221 in words is "ninety-nine billion, five hundred thirty-five million, seven hundred sixty-six thousand, two hundred twenty-one".