221000181 has 8 divisors (see below), whose sum is σ = 294877440. Its totient is φ = 147228192.

The previous prime is 221000141. The next prime is 221000243. The reversal of 221000181 is 181000122.

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

It is not a de Polignac number, because 221000181 - 2⁷ = 221000053 is a prime.

It is a super-2 number, since 2×221000181² = 97682160004065522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221000181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221000141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21280 + ... + 29913.

It is an arithmetic number, because the mean of its divisors is an integer number (36859680).

Almost surely, 2^221000181 is an apocalyptic number.

It is an amenable number.

221000181 is a deficient number, since it is larger than the sum of its proper divisors (73877259).

221000181 is a wasteful number, since it uses less digits than its factorization.

221000181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52635.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 221000181 is about 14866.0748350060. The cubic root of 221000181 is about 604.5945246564.

The spelling of 221000181 in words is "two hundred twenty-one million, one hundred eighty-one", and thus it is an aban number.