221755982 has 16 divisors (see below), whose sum is σ = 393262560. Its totient is φ = 91760928.

The previous prime is 221755981. The next prime is 221755987. The reversal of 221755982 is 289557122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221755981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272693 + ... + 273504.

It is an arithmetic number, because the mean of its divisors is an integer number (24578910).

Almost surely, 2^221755982 is an apocalyptic number.

221755982 is a deficient number, since it is larger than the sum of its proper divisors (171506578).

221755982 is a wasteful number, since it uses less digits than its factorization.

221755982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546235.

The product of its digits is 100800, while the sum is 41.

The square root of 221755982 is about 14891.4734663834. The cubic root of 221755982 is about 605.2829603229.

The spelling of 221755982 in words is "two hundred twenty-one million, seven hundred fifty-five thousand, nine hundred eighty-two".