221404700 has 72 divisors (see below), whose sum is σ = 526466304. Its totient is φ = 80152000.

The previous prime is 221404699. The next prime is 221404727. The reversal of 221404700 is 7404122.

221404700 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 (20).

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, 473867 + ... + 474333.

It is an arithmetic number, because the mean of its divisors is an integer number (7312032).

Almost surely, 2^221404700 is an apocalyptic number.

221404700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221404700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263233152).

221404700 is an abundant number, since it is smaller than the sum of its proper divisors (305061604).

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

221404700 is a wasteful number, since it uses less digits than its factorization.

221404700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923 (or 916 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 221404700 is about 14879.6740555699. The cubic root of 221404700 is about 604.9631833344.

Adding to 221404700 its reverse (7404122), we get a palindrome (228808822).

The spelling of 221404700 in words is "two hundred twenty-one million, four hundred four thousand, seven hundred".