221335152 has 20 divisors (see below), whose sum is σ = 571782600. Its totient is φ = 73778368.

The previous prime is 221335129. The next prime is 221335159. The reversal of 221335152 is 251533122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221335159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2305527 + ... + 2305622.

It is an arithmetic number, because the mean of its divisors is an integer number (28589130).

Almost surely, 2^221335152 is an apocalyptic number.

It is an amenable number.

221335152 is an abundant number, since it is smaller than the sum of its proper divisors (350447448).

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

221335152 is a wasteful number, since it uses less digits than its factorization.

221335152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4611160 (or 4611154 counting only the distinct ones).

The product of its digits is 1800, while the sum is 24.

The square root of 221335152 is about 14877.3368584569. The cubic root of 221335152 is about 604.8998326983.

Adding to 221335152 its reverse (251533122), we get a palindrome (472868274).

The spelling of 221335152 in words is "two hundred twenty-one million, three hundred thirty-five thousand, one hundred fifty-two".