221911201 has 4 divisors (see below), whose sum is σ = 222424132. Its totient is φ = 221398272.

The previous prime is 221911189. The next prime is 221911211. The reversal of 221911201 is 102119122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27029601 + 194881600 = 5199^2 + 13960^2 .

It is a cyclic number.

It is not a de Polignac number, because 221911201 - 2⁷ = 221911073 is a prime.

It is a super-2 number, since 2×221911201² = 98489162258524802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221911211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255816 + ... + 256681.

It is an arithmetic number, because the mean of its divisors is an integer number (55606033).

Almost surely, 2^221911201 is an apocalyptic number.

It is an amenable number.

221911201 is a deficient number, since it is larger than the sum of its proper divisors (512931).

221911201 is an equidigital number, since it uses as much as digits as its factorization.

221911201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512930.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 221911201 is about 14896.6842283778. The cubic root of 221911201 is about 605.4241508076.

The spelling of 221911201 in words is "two hundred twenty-one million, nine hundred eleven thousand, two hundred one".