211234410221 has 8 divisors (see below), whose sum is σ = 213261685560. Its totient is φ = 209208759552.

The previous prime is 211234410217. The next prime is 211234410227. The reversal of 211234410221 is 122014432112.

It can be written as a sum of positive squares in 4 ways, for example, as 5907613321 + 205326796900 = 76861^2 + 453130^2 .

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 211234410221 - 2² = 211234410217 is a prime.

It is a super-2 number, since 2×211234410221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211234410227) 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, 144080 + ... + 665753.

It is an arithmetic number, because the mean of its divisors is an integer number (26657710695).

Almost surely, 2^211234410221 is an apocalyptic number.

It is an amenable number.

211234410221 is a deficient number, since it is larger than the sum of its proper divisors (2027275339).

211234410221 is a wasteful number, since it uses less digits than its factorization.

211234410221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812335.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 211234410221 its reverse (122014432112), we get a palindrome (333248842333).

It can be divided in two parts, 21123 and 4410221, that added together give a palindrome (4431344).

The spelling of 211234410221 in words is "two hundred eleven billion, two hundred thirty-four million, four hundred ten thousand, two hundred twenty-one".