9210121 has 2 divisors, whose sum is σ = 9210122. Its totient is φ = 9210120.

The previous prime is 9210119. The next prime is 9210133. The reversal of 9210121 is 1210129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7075600 + 2134521 = 2660^2 + 1461^2 .

It is a cyclic number.

It is not a de Polignac number, because 9210121 - 2¹ = 9210119 is a prime.

Together with 9210119, it forms a pair of twin primes.

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

It is a junction number, because it is equal to n+sod(n) for n = 9210095 and 9210104.

It is not a weakly prime, because it can be changed into another prime (9210161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4605060 + 4605061.

It is an arithmetic number, because the mean of its divisors is an integer number (4605061).

Almost surely, 2^9210121 is an apocalyptic number.

It is an amenable number.

9210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

9210121 is an equidigital number, since it uses as much as digits as its factorization.

9210121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 9210121 is about 3034.8181164610. The cubic root of 9210121 is about 209.6147206339.

The spelling of 9210121 in words is "nine million, two hundred ten thousand, one hundred twenty-one".