11211110122221 has 36 divisors (see below), whose sum is σ = 17839565149952. Its totient is φ = 7034421993408.

The previous prime is 11211110122133. The next prime is 11211110122271. The reversal of 11211110122221 is 12222101111211.

It is a happy number.

11211110122221 is a `hidden beast` number, since 1 + 1 + 211 + 110 + 122 + 221 = 666.

It is not a de Polignac number, because 11211110122221 - 2⁹ = 11211110121709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11211110122194 and 11211110122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211110122271) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 79750285 + ... + 79890738.

Almost surely, 2^{11211110122221} is an apocalyptic number.

It is an amenable number.

11211110122221 is a deficient number, since it is larger than the sum of its proper divisors (6628455027731).

11211110122221 is an equidigital number, since it uses as much as digits as its factorization.

11211110122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159641072 (or 159641043 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 11211110122221 its reverse (12222101111211), we get a palindrome (23433211233432).

The spelling of 11211110122221 in words is "eleven trillion, two hundred eleven billion, one hundred ten million, one hundred twenty-two thousand, two hundred twenty-one".