221331064 has 32 divisors (see below), whose sum is σ = 419717520. Its totient is φ = 109414656.

The previous prime is 221331053. The next prime is 221331091. The reversal of 221331064 is 460133122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392847 + ... + 393409.

Almost surely, 2^221331064 is an apocalyptic number.

It is an amenable number.

221331064 is a deficient number, since it is larger than the sum of its proper divisors (198386456).

221331064 is a wasteful number, since it uses less digits than its factorization.

221331064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039 (or 1035 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 221331064 is about 14877.1994676418. The cubic root of 221331064 is about 604.8961085637.

Adding to 221331064 its reverse (460133122), we get a palindrome (681464186).

The spelling of 221331064 in words is "two hundred twenty-one million, three hundred thirty-one thousand, sixty-four".