221650312 has 16 divisors (see below), whose sum is σ = 447563340. Its totient is φ = 102300096.

The previous prime is 221650309. The next prime is 221650339. The reversal of 221650312 is 213056122.

It can be written as a sum of positive squares in 2 ways, for example, as 220047556 + 1602756 = 14834^2 + 1266^2 .

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, 1065523 + ... + 1065730.

Almost surely, 2^221650312 is an apocalyptic number.

It is an amenable number.

221650312 is an abundant number, since it is smaller than the sum of its proper divisors (225913028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221650312 is a wasteful number, since it uses less digits than its factorization.

221650312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2131272 (or 2131268 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 221650312 is about 14887.9250401122. The cubic root of 221650312 is about 605.1868029583.

The spelling of 221650312 in words is "two hundred twenty-one million, six hundred fifty thousand, three hundred twelve".