221235132 has 48 divisors (see below), whose sum is σ = 531014400. Its totient is φ = 71660160.

The previous prime is 221235121. The next prime is 221235151. The reversal of 221235132 is 231532122.

It is a junction number, because it is equal to n+sod(n) for n = 221235099 and 221235108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61257 + ... + 64767.

It is an arithmetic number, because the mean of its divisors is an integer number (11062800).

Almost surely, 2^221235132 is an apocalyptic number.

It is an amenable number.

221235132 is an abundant number, since it is smaller than the sum of its proper divisors (309779268).

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

221235132 is a wasteful number, since it uses less digits than its factorization.

221235132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3666 (or 3664 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 221235132 is about 14873.9749898943. The cubic root of 221235132 is about 604.8087021263.

Adding to 221235132 its reverse (231532122), we get a palindrome (452767254).

The spelling of 221235132 in words is "two hundred twenty-one million, two hundred thirty-five thousand, one hundred thirty-two".