221463252 has 18 divisors (see below), whose sum is σ = 559809978. Its totient is φ = 73821072.

The previous prime is 221463247. The next prime is 221463289. The reversal of 221463252 is 252364122.

It is a happy number.

221463252 is a `hidden beast` number, since 2 + 21 + 4 + 632 + 5 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 136749636 + 84713616 = 11694^2 + 9204^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

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 in 5 ways as a sum of consecutive naturals, for example, 3075843 + ... + 3075914.

Almost surely, 2^221463252 is an apocalyptic number.

It is an amenable number.

221463252 is an abundant number, since it is smaller than the sum of its proper divisors (338346726).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221463252 is a wasteful number, since it uses less digits than its factorization.

221463252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6151767 (or 6151762 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 221463252 is about 14881.6414417228. The cubic root of 221463252 is about 605.0165075295.

The spelling of 221463252 in words is "two hundred twenty-one million, four hundred sixty-three thousand, two hundred fifty-two".