221331201 has 16 divisors (see below), whose sum is σ = 363210624. Its totient is φ = 116745984.

The previous prime is 221331199. The next prime is 221331251. The reversal of 221331201 is 102133122.

It is not a de Polignac number, because 221331201 - 2¹ = 221331199 is a prime.

It is a super-2 number, since 2×221331201² = 97975001072204802, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221331251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 405096 + ... + 405641.

It is an arithmetic number, because the mean of its divisors is an integer number (22700664).

Almost surely, 2^221331201 is an apocalyptic number.

221331201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221331201 is a deficient number, since it is larger than the sum of its proper divisors (141879423).

221331201 is a wasteful number, since it uses less digits than its factorization.

221331201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810760.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 221331201 is about 14877.2040720022. The cubic root of 221331201 is about 604.8962333703.

Adding to 221331201 its reverse (102133122), we get a palindrome (323464323).

The spelling of 221331201 in words is "two hundred twenty-one million, three hundred thirty-one thousand, two hundred one".