221433240 has 64 divisors (see below), whose sum is σ = 759202560. Its totient is φ = 50613120.

The previous prime is 221433227. The next prime is 221433257. The reversal of 221433240 is 42334122.

221433240 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 (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130966 + ... + 132645.

It is an arithmetic number, because the mean of its divisors is an integer number (11862540).

Almost surely, 2^221433240 is an apocalyptic number.

221433240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221433240 is an abundant number, since it is smaller than the sum of its proper divisors (537769320).

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

221433240 is a wasteful number, since it uses less digits than its factorization.

221433240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263632 (or 263628 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 221433240 is about 14880.6330510499. The cubic root of 221433240 is about 604.9891763198.

Adding to 221433240 its reverse (42334122), we get a palindrome (263767362).

The spelling of 221433240 in words is "two hundred twenty-one million, four hundred thirty-three thousand, two hundred forty".