99121211121 has 8 divisors (see below), whose sum is σ = 132243862464. Its totient is φ = 66039683600.

The previous prime is 99121211117. The next prime is 99121211129. The reversal of 99121211121 is 12111212199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99121211121 - 2² = 99121211117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99121211129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10275330 + ... + 10284971.

It is an arithmetic number, because the mean of its divisors is an integer number (16530482808).

Almost surely, 2^99121211121 is an apocalyptic number.

It is an amenable number.

99121211121 is a deficient number, since it is larger than the sum of its proper divisors (33122651343).

99121211121 is a wasteful number, since it uses less digits than its factorization.

99121211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20561911.

The product of its digits is 648, while the sum is 30.

The spelling of 99121211121 in words is "ninety-nine billion, one hundred twenty-one million, two hundred eleven thousand, one hundred twenty-one".