221590612 has 12 divisors (see below), whose sum is σ = 388068660. Its totient is φ = 110713856.

The previous prime is 221590601. The next prime is 221590637. The reversal of 221590612 is 216095122.

It can be written as a sum of positive squares in 2 ways, for example, as 77686596 + 143904016 = 8814^2 + 11996^2 .

It is a congruent 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, 14023 + ... + 25294.

It is an arithmetic number, because the mean of its divisors is an integer number (32339055).

Almost surely, 2^221590612 is an apocalyptic number.

It is an amenable number.

221590612 is a deficient number, since it is larger than the sum of its proper divisors (166478048).

221590612 is a wasteful number, since it uses less digits than its factorization.

221590612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40730 (or 40728 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 221590612 is about 14885.9199245461. The cubic root of 221590612 is about 605.1324637666.

The spelling of 221590612 in words is "two hundred twenty-one million, five hundred ninety thousand, six hundred twelve".