9921255 has 8 divisors (see below), whose sum is σ = 15874032. Its totient is φ = 5291328.

The previous prime is 9921227. The next prime is 9921259. The reversal of 9921255 is 5521299.

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

It is not a de Polignac number, because 9921255 - 2²⁰ = 8872679 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9921259) 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, 330694 + ... + 330723.

It is an arithmetic number, because the mean of its divisors is an integer number (1984254).

Almost surely, 2^9921255 is an apocalyptic number.

9921255 is a deficient number, since it is larger than the sum of its proper divisors (5952777).

9921255 is a wasteful number, since it uses less digits than its factorization.

9921255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661425.

The product of its digits is 8100, while the sum is 33.

The square root of 9921255 is about 3149.8023747531. The cubic root of 9921255 is about 214.8764749247.

The spelling of 9921255 in words is "nine million, nine hundred twenty-one thousand, two hundred fifty-five".