211400221 has 8 divisors (see below), whose sum is σ = 213723360. Its totient is φ = 209083728.

The previous prime is 211400183. The next prime is 211400237. The reversal of 211400221 is 122004112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211400221 - 2¹⁹ = 210875933 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 (211400281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87295 + ... + 89683.

It is an arithmetic number, because the mean of its divisors is an integer number (26715420).

Almost surely, 2^211400221 is an apocalyptic number.

It is an amenable number.

211400221 is a deficient number, since it is larger than the sum of its proper divisors (2323139).

211400221 is a wasteful number, since it uses less digits than its factorization.

211400221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3323.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 211400221 is about 14539.6086948721. The cubic root of 211400221 is about 595.7103499619.

Adding to 211400221 its reverse (122004112), we get a palindrome (333404333).

The spelling of 211400221 in words is "two hundred eleven million, four hundred thousand, two hundred twenty-one".