99175221 has 6 divisors (see below), whose sum is σ = 143253110. Its totient is φ = 66116808.

The previous prime is 99175211. The next prime is 99175261. The reversal of 99175221 is 12257199.

It can be written as a sum of positive squares in only one way, i.e., 85932900 + 13242321 = 9270^2 + 3639^2 .

It is not a de Polignac number, because 99175221 - 2¹⁰ = 99174197 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 (99175211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5509726 + ... + 5509743.

Almost surely, 2^99175221 is an apocalyptic number.

It is an amenable number.

99175221 is a deficient number, since it is larger than the sum of its proper divisors (44077889).

99175221 is a wasteful number, since it uses less digits than its factorization.

99175221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11019475 (or 11019472 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 99175221 is about 9958.6756649667. The cubic root of 99175221 is about 462.8792638768.

The spelling of 99175221 in words is "ninety-nine million, one hundred seventy-five thousand, two hundred twenty-one".