221033400 has 96 divisors (see below), whose sum is σ = 783104640. Its totient is φ = 50520960.

The previous prime is 221033377. The next prime is 221033429. The reversal of 221033400 is 4330122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221033400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22114 + ... + 30513.

It is an arithmetic number, because the mean of its divisors is an integer number (8157340).

Almost surely, 2^221033400 is an apocalyptic number.

221033400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221033400 is an abundant number, since it is smaller than the sum of its proper divisors (562071240).

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

221033400 is a wasteful number, since it uses less digits than its factorization.

221033400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52653 (or 52644 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 221033400 is about 14867.1920684439. The cubic root of 221033400 is about 604.6248157617.

Adding to 221033400 its reverse (4330122), we get a palindrome (225363522).

The spelling of 221033400 in words is "two hundred twenty-one million, thirty-three thousand, four hundred".