221656450 has 12 divisors (see below), whose sum is σ = 412281090. Its totient is φ = 88662560.

The previous prime is 221656427. The next prime is 221656459. The reversal of 221656450 is 54656122.

It can be written as a sum of positive squares in 3 ways, for example, as 125596849 + 96059601 = 11207^2 + 9801^2 .

It is a super-3 number, since 3×221656450³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (221656459) by changing a digit.

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, 2216515 + ... + 2216614.

Almost surely, 2^221656450 is an apocalyptic number.

221656450 is a deficient number, since it is larger than the sum of its proper divisors (190624640).

221656450 is a wasteful number, since it uses less digits than its factorization.

221656450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4433141 (or 4433136 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 221656450 is about 14888.1311788955. The cubic root of 221656450 is about 605.1923892386.

The spelling of 221656450 in words is "two hundred twenty-one million, six hundred fifty-six thousand, four hundred fifty".