221856946 has 4 divisors (see below), whose sum is σ = 332785422. Its totient is φ = 110928472.

The previous prime is 221856937. The next prime is 221856959. The reversal of 221856946 is 649658122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 220671025 + 1185921 = 14855^2 + 1089^2 .

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 as a sum of consecutive naturals, namely, 55464235 + ... + 55464238.

Almost surely, 2^221856946 is an apocalyptic number.

221856946 is a deficient number, since it is larger than the sum of its proper divisors (110928476).

221856946 is a wasteful number, since it uses less digits than its factorization.

221856946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110928475.

The product of its digits is 207360, while the sum is 43.

The square root of 221856946 is about 14894.8630742280. The cubic root of 221856946 is about 605.3748067991.

The spelling of 221856946 in words is "two hundred twenty-one million, eight hundred fifty-six thousand, nine hundred forty-six".