221211232 has 36 divisors (see below), whose sum is σ = 478709028. Its totient is φ = 100548800.

The previous prime is 221211229. The next prime is 221211233. The reversal of 221211232 is 232112122.

It is a happy number.

221211232 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211233) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24694 + ... + 32437.

It is an arithmetic number, because the mean of its divisors is an integer number (13297473).

Almost surely, 2^221211232 is an apocalyptic number.

221211232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221211232 is an abundant number, since it is smaller than the sum of its proper divisors (257497796).

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

221211232 is a wasteful number, since it uses less digits than its factorization.

221211232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57163 (or 57144 counting only the distinct ones).

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

The square root of 221211232 is about 14873.1715514883. The cubic root of 221211232 is about 604.7869222091.

Adding to 221211232 its reverse (232112122), we get a palindrome (453323354).

The spelling of 221211232 in words is "two hundred twenty-one million, two hundred eleven thousand, two hundred thirty-two".