221201400 has 96 divisors (see below), whose sum is σ = 783699840. Its totient is φ = 50559360.

The previous prime is 221201369. The next prime is 221201447. The reversal of 221201400 is 4102122.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 22134 + ... + 30533.

It is an arithmetic number, because the mean of its divisors is an integer number (8163540).

Almost surely, 2^221201400 is an apocalyptic number.

221201400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221201400 is an abundant number, since it is smaller than the sum of its proper divisors (562498440).

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

221201400 is a wasteful number, since it uses less digits than its factorization.

221201400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52693 (or 52684 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 221201400 is about 14872.8410197917. The cubic root of 221201400 is about 604.7779619150. Note that the first 3 decimals are identical.

Adding to 221201400 its reverse (4102122), we get a palindrome (225303522).

The spelling of 221201400 in words is "two hundred twenty-one million, two hundred one thousand, four hundred".