99853221 has 8 divisors (see below), whose sum is σ = 143379040. Its totient is φ = 61448112.

The previous prime is 99853217. The next prime is 99853231. The reversal of 99853221 is 12235899.

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

It is not a de Polignac number, because 99853221 - 2² = 99853217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 2560339 = 99853221 / (9 + 9 + 8 + 5 + 3 + 2 + 2 + 1).

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99853221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99853231) 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, 1280131 + ... + 1280208.

It is an arithmetic number, because the mean of its divisors is an integer number (17922380).

Almost surely, 2^99853221 is an apocalyptic number.

It is an amenable number.

99853221 is a deficient number, since it is larger than the sum of its proper divisors (43525819).

99853221 is a wasteful number, since it uses less digits than its factorization.

99853221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2560355.

The product of its digits is 38880, while the sum is 39.

The square root of 99853221 is about 9992.6583550124. The cubic root of 99853221 is about 463.9316762384.

The spelling of 99853221 in words is "ninety-nine million, eight hundred fifty-three thousand, two hundred twenty-one".