221325132 has 24 divisors (see below), whose sum is σ = 590200576. Its totient is φ = 63235728.

The previous prime is 221325131. The next prime is 221325179. The reversal of 221325132 is 231523122.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 221325099 and 221325108.

It is not an unprimeable number, because it can be changed into a prime (221325131) 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 7 ways as a sum of consecutive naturals, for example, 1317328 + ... + 1317495.

Almost surely, 2^221325132 is an apocalyptic number.

It is an amenable number.

221325132 is an abundant number, since it is smaller than the sum of its proper divisors (368875444).

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

221325132 is a wasteful number, since it uses less digits than its factorization.

221325132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2634837 (or 2634835 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 221325132 is about 14877.0001008268. Note that the first 3 decimals coincide. The cubic root of 221325132 is about 604.8907044785.

Adding to 221325132 its reverse (231523122), we get a palindrome (452848254).

The spelling of 221325132 in words is "two hundred twenty-one million, three hundred twenty-five thousand, one hundred thirty-two".