99210221 has 8 divisors (see below), whose sum is σ = 108317088. Its totient is φ = 90118000.

The previous prime is 99210197. The next prime is 99210233. The reversal of 99210221 is 12201299.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 99210221 - 2⁶ = 99210157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99210281) 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, 14411 + ... + 20151.

It is an arithmetic number, because the mean of its divisors is an integer number (13539636).

Almost surely, 2^99210221 is an apocalyptic number.

It is an amenable number.

99210221 is a deficient number, since it is larger than the sum of its proper divisors (9106867).

99210221 is a wasteful number, since it uses less digits than its factorization.

99210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7323.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 99210221 is about 9960.4327717223. The cubic root of 99210221 is about 462.9337091594.

The spelling of 99210221 in words is "ninety-nine million, two hundred ten thousand, two hundred twenty-one".