921382171 has 4 divisors (see below), whose sum is σ = 953154000. Its totient is φ = 889610344.

The previous prime is 921382117. The next prime is 921382183. The reversal of 921382171 is 171283129.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 171283129 = 103 ⋅1662943.

It is a cyclic number.

It is not a de Polignac number, because 921382171 - 2¹¹ = 921380123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921382471) 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, 15885871 + ... + 15885928.

It is an arithmetic number, because the mean of its divisors is an integer number (238288500).

Almost surely, 2^921382171 is an apocalyptic number.

921382171 is a deficient number, since it is larger than the sum of its proper divisors (31771829).

921382171 is a wasteful number, since it uses less digits than its factorization.

921382171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31771828.

The product of its digits is 6048, while the sum is 34.

The square root of 921382171 is about 30354.2776392389. The cubic root of 921382171 is about 973.0756419552.

The spelling of 921382171 in words is "nine hundred twenty-one million, three hundred eighty-two thousand, one hundred seventy-one".