221256650 has 12 divisors (see below), whose sum is σ = 411537462. Its totient is φ = 88502640.

The previous prime is 221256617. The next prime is 221256677. The reversal of 221256650 is 56652122.

It can be written as a sum of positive squares in 3 ways, for example, as 110649361 + 110607289 = 10519^2 + 10517^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

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 5 ways as a sum of consecutive naturals, for example, 2212517 + ... + 2212616.

Almost surely, 2^221256650 is an apocalyptic number.

221256650 is a deficient number, since it is larger than the sum of its proper divisors (190280812).

221256650 is a wasteful number, since it uses less digits than its factorization.

221256650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4425145 (or 4425140 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 221256650 is about 14874.6983162685. The cubic root of 221256650 is about 604.8283100002.

The spelling of 221256650 in words is "two hundred twenty-one million, two hundred fifty-six thousand, six hundred fifty".