211344221 has 16 divisors (see below), whose sum is σ = 244747008. Its totient is φ = 180364800.

The previous prime is 211344191. The next prime is 211344223. The reversal of 211344221 is 122443112.

It is a de Polignac number, because none of the positive numbers 2^k-211344221 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211344193 and 211344202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211344223) 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, 85361 + ... + 87801.

It is an arithmetic number, because the mean of its divisors is an integer number (15296688).

Almost surely, 2^211344221 is an apocalyptic number.

It is an amenable number.

211344221 is a deficient number, since it is larger than the sum of its proper divisors (33402787).

211344221 is a wasteful number, since it uses less digits than its factorization.

211344221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2932.

The product of its digits is 384, while the sum is 20.

The square root of 211344221 is about 14537.6827933478. The cubic root of 211344221 is about 595.6577440161.

Adding to 211344221 its reverse (122443112), we get a palindrome (333787333).

The spelling of 211344221 in words is "two hundred eleven million, three hundred forty-four thousand, two hundred twenty-one".