221201138 has 8 divisors (see below), whose sum is σ = 332311788. Its totient is φ = 110430544.

The previous prime is 221201137. The next prime is 221201153. The reversal of 221201138 is 831102122.

It can be written as a sum of positive squares in 2 ways, for example, as 206123449 + 15077689 = 14357^2 + 3883^2 .

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

It is not an unprimeable number, because it can be changed into a prime (221201131) 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, 83381 + ... + 85992.

Almost surely, 2^221201138 is an apocalyptic number.

221201138 is a deficient number, since it is larger than the sum of its proper divisors (111110650).

221201138 is a wasteful number, since it uses less digits than its factorization.

221201138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170028.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 221201138 is about 14872.8322117880. The cubic root of 221201138 is about 604.7777231403. Note that the first 4 decimals are identical.

The spelling of 221201138 in words is "two hundred twenty-one million, two hundred one thousand, one hundred thirty-eight".