217221092 has 48 divisors (see below), whose sum is σ = 434294784. Its totient is φ = 94164000.

The previous prime is 217221089. The next prime is 217221139. The reversal of 217221092 is 290122712.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95723 + ... + 97965.

It is an arithmetic number, because the mean of its divisors is an integer number (9047808).

Almost surely, 2^217221092 is an apocalyptic number.

217221092 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

217221092 is a deficient number, since it is larger than the sum of its proper divisors (217073692).

217221092 is a wasteful number, since it uses less digits than its factorization.

217221092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360 (or 2358 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 217221092 is about 14738.4223036253. The cubic root of 217221092 is about 601.1285168263.

The spelling of 217221092 in words is "two hundred seventeen million, two hundred twenty-one thousand, ninety-two".