221094138 has 8 divisors (see below), whose sum is σ = 442188288. Its totient is φ = 73698044.

The previous prime is 221094131. The next prime is 221094143. The reversal of 221094138 is 831490122.

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

221094138 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (221094131) 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, 18424506 + ... + 18424517.

It is an arithmetic number, because the mean of its divisors is an integer number (55273536).

Almost surely, 2^221094138 is an apocalyptic number.

221094138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221094138 is a wasteful number, since it uses less digits than its factorization.

221094138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36849028.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 221094138 is about 14869.2346137923. The cubic root of 221094138 is about 604.6801925190.

The spelling of 221094138 in words is "two hundred twenty-one million, ninety-four thousand, one hundred thirty-eight".