221542452 has 60 divisors (see below), whose sum is σ = 581160580. Its totient is φ = 73592064.

The previous prime is 221542439. The next prime is 221542459. The reversal of 221542452 is 254245122.

It can be written as a sum of positive squares in 2 ways, for example, as 159668496 + 61873956 = 12636^2 + 7866^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221542459) 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 in 19 ways as a sum of consecutive naturals, for example, 108174 + ... + 110202.

Almost surely, 2^221542452 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221542452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290580290).

221542452 is an abundant number, since it is smaller than the sum of its proper divisors (359618128).

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

221542452 is a wasteful number, since it uses less digits than its factorization.

221542452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2382 (or 2371 counting only the distinct ones).

The product of its digits is 6400, while the sum is 27.

The square root of 221542452 is about 14884.3022006408. The cubic root of 221542452 is about 605.0886212188.

Adding to 221542452 its reverse (254245122), we get a palindrome (475787574).

The spelling of 221542452 in words is "two hundred twenty-one million, five hundred forty-two thousand, four hundred fifty-two".