221684201 has 4 divisors (see below), whose sum is σ = 221816532. Its totient is φ = 221551872.

The previous prime is 221684167. The next prime is 221684219. The reversal of 221684201 is 102486122.

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 123654400 + 98029801 = 11120^2 + 9901^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221684201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221684251) 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, 63620 + ... + 67013.

It is an arithmetic number, because the mean of its divisors is an integer number (55454133).

Almost surely, 2^221684201 is an apocalyptic number.

It is an amenable number.

221684201 is a deficient number, since it is larger than the sum of its proper divisors (132331).

221684201 is a wasteful number, since it uses less digits than its factorization.

221684201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132330.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 221684201 is about 14889.0631337234. The cubic root of 221684201 is about 605.2176445277.

The spelling of 221684201 in words is "two hundred twenty-one million, six hundred eighty-four thousand, two hundred one".