99491201120221 has 4 divisors (see below), whose sum is σ = 99496347324892. Its totient is φ = 99486054915552.

The previous prime is 99491201120183. The next prime is 99491201120243. The reversal of 99491201120221 is 12202110219499.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77174222032996 + 22316979087225 = 8784886^2 + 4724085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99491201120221 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 (99491201120261) 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, 2573073336 + ... + 2573112001.

It is an arithmetic number, because the mean of its divisors is an integer number (24874086831223).

Almost surely, 2^{99491201120221} is an apocalyptic number.

It is an amenable number.

99491201120221 is a deficient number, since it is larger than the sum of its proper divisors (5146204671).

99491201120221 is a wasteful number, since it uses less digits than its factorization.

99491201120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5146204670.

The product of its (nonzero) digits is 46656, while the sum is 43.

The spelling of 99491201120221 in words is "ninety-nine trillion, four hundred ninety-one billion, two hundred one million, one hundred twenty thousand, two hundred twenty-one".