221986946 has 16 divisors (see below), whose sum is σ = 338587776. Its totient is φ = 109130736.

The previous prime is 221986943. The next prime is 221986979. The reversal of 221986946 is 649689122.

221986946 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 221986946.

It is not an unprimeable number, because it can be changed into a prime (221986943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89495 + ... + 91941.

It is an arithmetic number, because the mean of its divisors is an integer number (21161736).

Almost surely, 2^221986946 is an apocalyptic number.

221986946 is a deficient number, since it is larger than the sum of its proper divisors (116600830).

221986946 is a wasteful number, since it uses less digits than its factorization.

221986946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3193.

The product of its digits is 373248, while the sum is 47.

The square root of 221986946 is about 14899.2263557542. The cubic root of 221986946 is about 605.4930261589.

The spelling of 221986946 in words is "two hundred twenty-one million, nine hundred eighty-six thousand, nine hundred forty-six".