9921671 has 4 divisors (see below), whose sum is σ = 10353072. Its totient is φ = 9490272.

The previous prime is 9921641. The next prime is 9921679. The reversal of 9921671 is 1761299.

9921671 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9921671 - 2²² = 5727367 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 (9921679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215666 + ... + 215711.

It is an arithmetic number, because the mean of its divisors is an integer number (2588268).

Almost surely, 2^9921671 is an apocalyptic number.

9921671 is a deficient number, since it is larger than the sum of its proper divisors (431401).

9921671 is a wasteful number, since it uses less digits than its factorization.

9921671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431400.

The product of its digits is 6804, while the sum is 35.

The square root of 9921671 is about 3149.8684099499. The cubic root of 9921671 is about 214.8794781525.

The spelling of 9921671 in words is "nine million, nine hundred twenty-one thousand, six hundred seventy-one".