9169210921 has 4 divisors (see below), whose sum is σ = 9874534852. Its totient is φ = 8463886992.

The previous prime is 9169210879. The next prime is 9169210927. The reversal of 9169210921 is 1290129619.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1290129619 = 26107 ⋅49417.

It can be written as a sum of positive squares in 2 ways, for example, as 4561516521 + 4607694400 = 67539^2 + 67880^2 .

It is a cyclic number.

It is not a de Polignac number, because 9169210921 - 2⁹ = 9169210409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9169210927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352661946 + ... + 352661971.

It is an arithmetic number, because the mean of its divisors is an integer number (2468633713).

Almost surely, 2^9169210921 is an apocalyptic number.

It is an amenable number.

9169210921 is a deficient number, since it is larger than the sum of its proper divisors (705323931).

9169210921 is a wasteful number, since it uses less digits than its factorization.

9169210921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705323930.

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 9169210921 is about 95755.9967887129. The cubic root of 9169210921 is about 2093.0390014089.

The spelling of 9169210921 in words is "nine billion, one hundred sixty-nine million, two hundred ten thousand, nine hundred twenty-one".