211010011222221 has 28 divisors (see below), whose sum is σ = 322339542009948. Its totient is φ = 138019126811904.

The previous prime is 211010011222217. The next prime is 211010011222271. The reversal of 211010011222221 is 122222110010112.

211010011222221 is a `hidden beast` number, since 2 + 110 + 100 + 11 + 222 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 110685949106121 + 100324062116100 = 10520739^2 + 10016190^2 .

It is not a de Polignac number, because 211010011222221 - 2² = 211010011222217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211010011222194 and 211010011222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211010011222211) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2730634180 + ... + 2730711453.

Almost surely, 2^{211010011222221} is an apocalyptic number.

It is an amenable number.

211010011222221 is a deficient number, since it is larger than the sum of its proper divisors (111329530787727).

211010011222221 is an frugal number, since it uses more digits than its factorization.

211010011222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5461345704 (or 5461345689 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 211010011222221 its reverse (122222110010112), we get a palindrome (333232121232333).

The spelling of 211010011222221 in words is "two hundred eleven trillion, ten billion, eleven million, two hundred twenty-two thousand, two hundred twenty-one".