99121021110221 has 4 divisors (see below), whose sum is σ = 108132023029344. Its totient is φ = 90110019191100.

The previous prime is 99121021110173. The next prime is 99121021110253. The reversal of 99121021110221 is 12201112012199.

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 99121021110221 - 2³⁸ = 98846143203277 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 (99121021110521) 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, 4505500959545 + ... + 4505500959566.

It is an arithmetic number, because the mean of its divisors is an integer number (27033005757336).

Almost surely, 2^{99121021110221} is an apocalyptic number.

It is an amenable number.

99121021110221 is a deficient number, since it is larger than the sum of its proper divisors (9011001919123).

99121021110221 is a wasteful number, since it uses less digits than its factorization.

99121021110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9011001919122.

The product of its (nonzero) digits is 1296, while the sum is 32.

The spelling of 99121021110221 in words is "ninety-nine trillion, one hundred twenty-one billion, twenty-one million, one hundred ten thousand, two hundred twenty-one".