221575149 has 32 divisors (see below), whose sum is σ = 335616000. Its totient is φ = 144435312.

The previous prime is 221575121. The next prime is 221575163. The reversal of 221575149 is 941575122.

It is not a de Polignac number, because 221575149 - 2¹¹ = 221573101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221575349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 584442 + ... + 584820.

It is an arithmetic number, because the mean of its divisors is an integer number (10488000).

Almost surely, 2^221575149 is an apocalyptic number.

It is an amenable number.

221575149 is a deficient number, since it is larger than the sum of its proper divisors (114040851).

221575149 is a wasteful number, since it uses less digits than its factorization.

221575149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814 (or 808 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 221575149 is about 14885.4005320650. The cubic root of 221575149 is about 605.1183876875.

The spelling of 221575149 in words is "two hundred twenty-one million, five hundred seventy-five thousand, one hundred forty-nine".