221545256 has 16 divisors (see below), whose sum is σ = 416037600. Its totient is φ = 110601904.

The previous prime is 221545249. The next prime is 221545283. The reversal of 221545256 is 652545122.

It is a super-2 number, since 2×221545256² = 98164600912211072, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 15740 + ... + 26283.

It is an arithmetic number, because the mean of its divisors is an integer number (26002350).

Almost surely, 2^221545256 is an apocalyptic number.

It is an amenable number.

221545256 is a deficient number, since it is larger than the sum of its proper divisors (194492344).

221545256 is a wasteful number, since it uses less digits than its factorization.

221545256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42688 (or 42684 counting only the distinct ones).

The product of its digits is 24000, while the sum is 32.

The square root of 221545256 is about 14884.3963935391. The cubic root of 221545256 is about 605.0911740197.

The spelling of 221545256 in words is "two hundred twenty-one million, five hundred forty-five thousand, two hundred fifty-six".