211221221110101 has 20 divisors (see below), whose sum is σ = 315529121404332. Its totient is φ = 140813645591808.

The previous prime is 211221221109937. The next prime is 211221221110111. The reversal of 211221221110101 is 101011122122112.

It is a happy number.

211221221110101 is a `hidden beast` number, since 2 + 11 + 221 + 221 + 110 + 101 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 114109952315076 + 97111268795025 = 10682226^2 + 9854505^2 .

It is not a de Polignac number, because 211221221110101 - 2¹⁹ = 211221220585813 is a prime.

It is a super-2 number, since 2×211221221110101² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221221110111) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18958981 + ... + 27962213.

Almost surely, 2^{211221221110101} is an apocalyptic number.

It is an amenable number.

211221221110101 is a deficient number, since it is larger than the sum of its proper divisors (104307900294231).

211221221110101 is an equidigital number, since it uses as much as digits as its factorization.

211221221110101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9292882 (or 9292873 counting only the distinct ones).

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

Adding to 211221221110101 its reverse (101011122122112), we get a palindrome (312232343232213).

The spelling of 211221221110101 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred ten thousand, one hundred one".