9216121 has 4 divisors (see below), whose sum is σ = 9701200. Its totient is φ = 8731044.

The previous prime is 9216107. The next prime is 9216133. The reversal of 9216121 is 1216129.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1216129 = 17 ⋅71537.

It is a cyclic number.

It is not a de Polignac number, because 9216121 - 2¹⁹ = 8691833 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9216092 and 9216101.

It is not an unprimeable number, because it can be changed into a prime (9216101) 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, 242511 + ... + 242548.

It is an arithmetic number, because the mean of its divisors is an integer number (2425300).

Almost surely, 2^9216121 is an apocalyptic number.

It is an amenable number.

9216121 is a deficient number, since it is larger than the sum of its proper divisors (485079).

9216121 is a wasteful number, since it uses less digits than its factorization.

9216121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485078.

The product of its digits is 216, while the sum is 22.

The square root of 9216121 is about 3035.8064826336. The cubic root of 9216121 is about 209.6602290955.

It can be divided in two parts, 9216 and 121, that multiplied together give a square (1115136 = 1056²).

The spelling of 9216121 in words is "nine million, two hundred sixteen thousand, one hundred twenty-one".