99900221312 has 16 divisors (see below), whose sum is σ = 199019972400. Its totient is φ = 49950110592.

The previous prime is 99900221299. The next prime is 99900221347. The reversal of 99900221312 is 21312200999.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390235112 + ... + 390235367.

It is an arithmetic number, because the mean of its divisors is an integer number (12438748275).

Almost surely, 2^99900221312 is an apocalyptic number.

It is an amenable number.

99900221312 is a deficient number, since it is larger than the sum of its proper divisors (99119751088).

99900221312 is an equidigital number, since it uses as much as digits as its factorization.

99900221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780470493 (or 780470481 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 38.

The spelling of 99900221312 in words is "ninety-nine billion, nine hundred million, two hundred twenty-one thousand, three hundred twelve".