9123921 has 12 divisors (see below), whose sum is σ = 13667472. Its totient is φ = 6082452.

The previous prime is 9123901. The next prime is 9123923. The reversal of 9123921 is 1293219.

It is not a de Polignac number, because 9123921 - 2²¹ = 7026769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (9123923) 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, 18531 + ... + 19016.

It is an arithmetic number, because the mean of its divisors is an integer number (1138956).

Almost surely, 2^9123921 is an apocalyptic number.

It is an amenable number.

9123921 is a deficient number, since it is larger than the sum of its proper divisors (4543551).

9123921 is an equidigital number, since it uses as much as digits as its factorization.

9123921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37562 (or 37550 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 9123921 is about 3020.5828907679. The cubic root of 9123921 is about 208.9587229519.

The spelling of 9123921 in words is "nine million, one hundred twenty-three thousand, nine hundred twenty-one".