221021232 has 20 divisors (see below), whose sum is σ = 570971640. Its totient is φ = 73673728.

The previous prime is 221021221. The next prime is 221021249. The reversal of 221021232 is 232120122.

It is a happy 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, 2302257 + ... + 2302352.

It is an arithmetic number, because the mean of its divisors is an integer number (28548582).

Almost surely, 2^221021232 is an apocalyptic number.

It is an amenable number.

221021232 is an abundant number, since it is smaller than the sum of its proper divisors (349950408).

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

221021232 is a wasteful number, since it uses less digits than its factorization.

221021232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4604620 (or 4604614 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 221021232 is about 14866.7828396059. The cubic root of 221021232 is about 604.6137205913.

Adding to 221021232 its reverse (232120122), we get a palindrome (453141354).

The spelling of 221021232 in words is "two hundred twenty-one million, twenty-one thousand, two hundred thirty-two".