9905211 has 12 divisors (see below), whose sum is σ = 14801280. Its totient is φ = 6375600.

The previous prime is 9905209. The next prime is 9905221. The reversal of 9905211 is 1125099.

It is a happy number.

9905211 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9905211 - 2¹ = 9905209 is a prime.

It is a super-2 number, since 2×9905211² = 196226409909042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9905221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18715 + ... + 19236.

It is an arithmetic number, because the mean of its divisors is an integer number (1233440).

Almost surely, 2^9905211 is an apocalyptic number.

9905211 is a deficient number, since it is larger than the sum of its proper divisors (4896069).

9905211 is a wasteful number, since it uses less digits than its factorization.

9905211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37986 (or 37983 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 9905211 is about 3147.2545178298. The cubic root of 9905211 is about 214.7605844055.

The spelling of 9905211 in words is "nine million, nine hundred five thousand, two hundred eleven".