221438232 has 64 divisors (see below), whose sum is σ = 617493600. Its totient is φ = 73526400.

The previous prime is 221438219. The next prime is 221438249. The reversal of 221438232 is 232834122.

221438232 is a `hidden beast` number, since 221 + 438 + 2 + 3 + 2 = 666.

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

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 = 221438196 and 221438205.

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, 57982 + ... + 61682.

Almost surely, 2^221438232 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 221438232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (308746800).

221438232 is an abundant number, since it is smaller than the sum of its proper divisors (396055368).

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

221438232 is a wasteful number, since it uses less digits than its factorization.

221438232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3993 (or 3983 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 221438232 is about 14880.8007849040. The cubic root of 221438232 is about 604.9937225859.

The spelling of 221438232 in words is "two hundred twenty-one million, four hundred thirty-eight thousand, two hundred thirty-two".