221572084 has 12 divisors (see below), whose sum is σ = 410560164. Its totient is φ = 104269184.

The previous prime is 221572079. The next prime is 221572121. The reversal of 221572084 is 480275122.

It is a happy number.

221572084 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 82992100 + 138579984 = 9110^2 + 11772^2 .

221572084 is strictly pandigital in base 9.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1629139 + ... + 1629274.

It is an arithmetic number, because the mean of its divisors is an integer number (34213347).

Almost surely, 2^221572084 is an apocalyptic number.

It is an amenable number.

221572084 is a deficient number, since it is larger than the sum of its proper divisors (188988080).

221572084 is a wasteful number, since it uses less digits than its factorization.

221572084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3258434 (or 3258432 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 221572084 is about 14885.2975784833. The cubic root of 221572084 is about 605.1155975184.

The spelling of 221572084 in words is "two hundred twenty-one million, five hundred seventy-two thousand, eighty-four".