221090188 has 12 divisors (see below), whose sum is σ = 422081352. Its totient is φ = 100495520.

The previous prime is 221090173. The next prime is 221090273. The reversal of 221090188 is 881090122.

It is a happy number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2512345 + ... + 2512432.

It is an arithmetic number, because the mean of its divisors is an integer number (35173446).

Almost surely, 2^221090188 is an apocalyptic number.

It is an amenable number.

221090188 is a deficient number, since it is larger than the sum of its proper divisors (200991164).

221090188 is a wasteful number, since it uses less digits than its factorization.

221090188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5024792 (or 5024790 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 221090188 is about 14869.1017886085. The cubic root of 221090188 is about 604.6765914873.

The spelling of 221090188 in words is "two hundred twenty-one million, ninety thousand, one hundred eighty-eight".