921166213 has 8 divisors (see below), whose sum is σ = 1005222240. Its totient is φ = 837162480.

The previous prime is 921166201. The next prime is 921166219. The reversal of 921166213 is 312661129.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 921166213 - 2⁹ = 921165701 is a prime.

It is a super-2 number, since 2×921166213² = 1697094383945522738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921166219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29931 + ... + 52327.

It is an arithmetic number, because the mean of its divisors is an integer number (125652780).

Almost surely, 2^921166213 is an apocalyptic number.

It is an amenable number.

921166213 is a deficient number, since it is larger than the sum of its proper divisors (84056027).

921166213 is a wasteful number, since it uses less digits than its factorization.

921166213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26147.

The product of its digits is 3888, while the sum is 31.

The square root of 921166213 is about 30350.7201397265. The cubic root of 921166213 is about 972.9996112930. Note that the first 3 decimals are identical.

The spelling of 921166213 in words is "nine hundred twenty-one million, one hundred sixty-six thousand, two hundred thirteen".