221330450 has 24 divisors (see below), whose sum is σ = 449100720. Its totient is φ = 80483600.

The previous prime is 221330441. The next prime is 221330453. The reversal of 221330450 is 54033122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (221330453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 200660 + ... + 201759.

It is an arithmetic number, because the mean of its divisors is an integer number (18712530).

Almost surely, 2^221330450 is an apocalyptic number.

221330450 is an abundant number, since it is smaller than the sum of its proper divisors (227770270).

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

221330450 is a wasteful number, since it uses less digits than its factorization.

221330450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402442 (or 402437 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 221330450 is about 14877.1788320232. The cubic root of 221330450 is about 604.8955492107.

Adding to 221330450 its reverse (54033122), we get a palindrome (275363572).

The spelling of 221330450 in words is "two hundred twenty-one million, three hundred thirty thousand, four hundred fifty".