221421232 has 20 divisors (see below), whose sum is σ = 429262456. Its totient is φ = 110643840.

The previous prime is 221421173. The next prime is 221421241. The reversal of 221421232 is 232124122.

221421232 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 33463 + ... + 39529.

Almost surely, 2^221421232 is an apocalyptic number.

It is an amenable number.

221421232 is a deficient number, since it is larger than the sum of its proper divisors (207841224).

221421232 is a wasteful number, since it uses less digits than its factorization.

221421232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8356 (or 8350 counting only the distinct ones).

The product of its digits is 384, while the sum is 19.

The square root of 221421232 is about 14880.2295681216. The cubic root of 221421232 is about 604.9782402301.

Adding to 221421232 its reverse (232124122), we get a palindrome (453545354).

The spelling of 221421232 in words is "two hundred twenty-one million, four hundred twenty-one thousand, two hundred thirty-two".