214445221 has 4 divisors (see below), whose sum is σ = 214512172. Its totient is φ = 214378272.

The previous prime is 214445219. The next prime is 214445239. The reversal of 214445221 is 122544412.

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 209844196 + 4601025 = 14486^2 + 2145^2 .

It is a cyclic number.

It is not a de Polignac number, because 214445221 - 2¹ = 214445219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (214445251) 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, 28416 + ... + 35161.

It is an arithmetic number, because the mean of its divisors is an integer number (53628043).

Almost surely, 2^214445221 is an apocalyptic number.

It is an amenable number.

214445221 is a deficient number, since it is larger than the sum of its proper divisors (66951).

214445221 is an equidigital number, since it uses as much as digits as its factorization.

214445221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66950.

The product of its digits is 2560, while the sum is 25.

The square root of 214445221 is about 14643.9482722386. The cubic root of 214445221 is about 598.5569218063.

Adding to 214445221 its reverse (122544412), we get a palindrome (336989633).

The spelling of 214445221 in words is "two hundred fourteen million, four hundred forty-five thousand, two hundred twenty-one".