221554252 has 6 divisors (see below), whose sum is σ = 387719948. Its totient is φ = 110777124.

The previous prime is 221554237. The next prime is 221554253. The reversal of 221554252 is 252455122.

It is a self number, because there is not a number n which added to its sum of digits gives 221554252.

It is not an unprimeable number, because it can be changed into a prime (221554253) by changing a digit.

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, 27694278 + ... + 27694285.

Almost surely, 2^221554252 is an apocalyptic number.

It is an amenable number.

221554252 is a deficient number, since it is larger than the sum of its proper divisors (166165696).

221554252 is a wasteful number, since it uses less digits than its factorization.

221554252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55388567 (or 55388565 counting only the distinct ones).

The product of its digits is 8000, while the sum is 28.

The square root of 221554252 is about 14884.6985861320. The cubic root of 221554252 is about 605.0993639589.

The spelling of 221554252 in words is "two hundred twenty-one million, five hundred fifty-four thousand, two hundred fifty-two".