221833240 has 16 divisors (see below), whose sum is σ = 499124880. Its totient is φ = 88733280.

The previous prime is 221833237. The next prime is 221833273. The reversal of 221833240 is 42338122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2772876 + ... + 2772955.

It is an arithmetic number, because the mean of its divisors is an integer number (31195305).

Almost surely, 2^221833240 is an apocalyptic number.

221833240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221833240 is an abundant number, since it is smaller than the sum of its proper divisors (277291640).

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

221833240 is a wasteful number, since it uses less digits than its factorization.

221833240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5545842 (or 5545838 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 221833240 is about 14894.0672752610. The cubic root of 221833240 is about 605.3532440660.

The spelling of 221833240 in words is "two hundred twenty-one million, eight hundred thirty-three thousand, two hundred forty".