221888470 has 16 divisors (see below), whose sum is σ = 403518528. Its totient is φ = 87840000.

The previous prime is 221888453. The next prime is 221888473. The reversal of 221888470 is 74888122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221888473) 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 7 ways as a sum of consecutive naturals, for example, 113406 + ... + 115345.

It is an arithmetic number, because the mean of its divisors is an integer number (25219908).

Almost surely, 2^221888470 is an apocalyptic number.

221888470 is a deficient number, since it is larger than the sum of its proper divisors (181630058).

221888470 is a wasteful number, since it uses less digits than its factorization.

221888470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228855.

The product of its (nonzero) digits is 57344, while the sum is 40.

The square root of 221888470 is about 14895.9212538198. The cubic root of 221888470 is about 605.4034783251.

The spelling of 221888470 in words is "two hundred twenty-one million, eight hundred eighty-eight thousand, four hundred seventy".