221248188 has 54 divisors (see below), whose sum is σ = 639844296. Its totient is φ = 63146304.

The previous prime is 221248133. The next prime is 221248211. The reversal of 221248188 is 881842122.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 235656 + ... + 236592.

Almost surely, 2^221248188 is an apocalyptic number.

221248188 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

221248188 is an abundant number, since it is smaller than the sum of its proper divisors (418596108).

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

221248188 is an equidigital number, since it uses as much as digits as its factorization.

221248188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1891 (or 949 counting only the distinct ones).

The product of its digits is 16384, while the sum is 36.

The square root of 221248188 is about 14874.4138708051. The cubic root of 221248188 is about 604.8205993131.

The spelling of 221248188 in words is "two hundred twenty-one million, two hundred forty-eight thousand, one hundred eighty-eight".