221121232 has 20 divisors (see below), whose sum is σ = 428757280. Its totient is φ = 110474208.

The previous prime is 221121223. The next prime is 221121253. The reversal of 221121232 is 232121122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19069 + ... + 28387.

It is an arithmetic number, because the mean of its divisors is an integer number (21437864).

Almost surely, 2^221121232 is an apocalyptic number.

It is an amenable number.

221121232 is a deficient number, since it is larger than the sum of its proper divisors (207636048).

221121232 is a wasteful number, since it uses less digits than its factorization.

221121232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10810 (or 10804 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 221121232 is about 14870.1456616941. The cubic root of 221121232 is about 604.7048917053.

Adding to 221121232 its reverse (232121122), we get a palindrome (453242354).

The spelling of 221121232 in words is "two hundred twenty-one million, one hundred twenty-one thousand, two hundred thirty-two".