211444221 has 16 divisors (see below), whose sum is σ = 294759936. Its totient is φ = 134569776.

The previous prime is 211444183. The next prime is 211444223. The reversal of 211444221 is 122444112.

It is not a de Polignac number, because 211444221 - 2¹⁴ = 211427837 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211444223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36126 + ... + 41568.

It is an arithmetic number, because the mean of its divisors is an integer number (18422496).

Almost surely, 2^211444221 is an apocalyptic number.

It is an amenable number.

211444221 is a deficient number, since it is larger than the sum of its proper divisors (83315715).

211444221 is a wasteful number, since it uses less digits than its factorization.

211444221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6032.

The product of its digits is 512, while the sum is 21.

The square root of 211444221 is about 14541.1217242687. The cubic root of 211444221 is about 595.7516766880.

Adding to 211444221 its reverse (122444112), we get a palindrome (333888333).

The spelling of 211444221 in words is "two hundred eleven million, four hundred forty-four thousand, two hundred twenty-one".