221819008 has 16 divisors (see below), whose sum is σ = 441905310. Its totient is φ = 110909440.

The previous prime is 221818957. The next prime is 221819011. The reversal of 221819008 is 800918122.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 221652544 + 166464 = 14888^2 + 408^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 866353 + ... + 866608.

Almost surely, 2^221819008 is an apocalyptic number.

It is an amenable number.

221819008 is a deficient number, since it is larger than the sum of its proper divisors (220086302).

221819008 is an equidigital number, since it uses as much as digits as its factorization.

221819008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732975 (or 1732963 counting only the distinct ones).

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

The square root of 221819008 is about 14893.5894934700. The cubic root of 221819008 is about 605.3402980476.

The spelling of 221819008 in words is "two hundred twenty-one million, eight hundred nineteen thousand, eight".