221475090 has 32 divisors (see below), whose sum is σ = 535118400. Its totient is φ = 58662464.

The previous prime is 221475017. The next prime is 221475097. The reversal of 221475090 is 90574122.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (221475097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20304 + ... + 29243.

It is an arithmetic number, because the mean of its divisors is an integer number (16722450).

Almost surely, 2^221475090 is an apocalyptic number.

221475090 is an abundant number, since it is smaller than the sum of its proper divisors (313643310).

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

221475090 is a wasteful number, since it uses less digits than its factorization.

221475090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49706.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 221475090 is about 14882.0391747905. The cubic root of 221475090 is about 605.0272874335.

The spelling of 221475090 in words is "two hundred twenty-one million, four hundred seventy-five thousand, ninety".