221442132 has 24 divisors (see below), whose sum is σ = 518980896. Its totient is φ = 73487968.

The previous prime is 221442103. The next prime is 221442149. The reversal of 221442132 is 231244122.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 221442099 and 221442108.

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 7 ways as a sum of consecutive naturals, for example, 37923 + ... + 43370.

It is an arithmetic number, because the mean of its divisors is an integer number (21624204).

Almost surely, 2^221442132 is an apocalyptic number.

It is an amenable number.

221442132 is an abundant number, since it is smaller than the sum of its proper divisors (297538764).

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

221442132 is a wasteful number, since it uses less digits than its factorization.

221442132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81527 (or 81525 counting only the distinct ones).

The product of its digits is 768, while the sum is 21.

The square root of 221442132 is about 14880.9318256620. The cubic root of 221442132 is about 604.9972743087.

Adding to 221442132 its reverse (231244122), we get a palindrome (452686254).

The spelling of 221442132 in words is "two hundred twenty-one million, four hundred forty-two thousand, one hundred thirty-two".