99121791271 has 4 divisors (see below), whose sum is σ = 99163599544. Its totient is φ = 99079983000.

The previous prime is 99121791259. The next prime is 99121791283. The reversal of 99121791271 is 17219712199.

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

It is an interprime number because it is at equal distance from previous prime (99121791259) and next prime (99121791283).

It is a cyclic number.

It is not a de Polignac number, because 99121791271 - 2¹⁷ = 99121660199 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 (99121791221) 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, 20900580 + ... + 20905321.

It is an arithmetic number, because the mean of its divisors is an integer number (24790899886).

Almost surely, 2^99121791271 is an apocalyptic number.

99121791271 is a deficient number, since it is larger than the sum of its proper divisors (41808273).

99121791271 is a wasteful number, since it uses less digits than its factorization.

99121791271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41808272.

The product of its digits is 142884, while the sum is 49.

The spelling of 99121791271 in words is "ninety-nine billion, one hundred twenty-one million, seven hundred ninety-one thousand, two hundred seventy-one".