221171361 has 16 divisors (see below), whose sum is σ = 299194368. Its totient is φ = 145314000.

The previous prime is 221171347. The next prime is 221171369. The reversal of 221171361 is 163171122.

It is not a de Polignac number, because 221171361 - 2⁶ = 221171297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221171369) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57480 + ... + 61206.

It is an arithmetic number, because the mean of its divisors is an integer number (18699648).

Almost surely, 2^221171361 is an apocalyptic number.

It is an amenable number.

221171361 is a deficient number, since it is larger than the sum of its proper divisors (78023007).

221171361 is a wasteful number, since it uses less digits than its factorization.

221171361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4012.

The product of its digits is 504, while the sum is 24.

The square root of 221171361 is about 14871.8311246464. The cubic root of 221171361 is about 604.7505845301.

The spelling of 221171361 in words is "two hundred twenty-one million, one hundred seventy-one thousand, three hundred sixty-one".