2111211220221 has 6 divisors (see below), whose sum is σ = 3049527318110. Its totient is φ = 1407474146808.

The previous prime is 2111211220201. The next prime is 2111211220243. The reversal of 2111211220221 is 1220221121112.

2111211220221 is a `hidden beast` number, since 2 + 1 + 11 + 211 + 220 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1635876812196 + 475334408025 = 1279014^2 + 689445^2 .

It is not a de Polignac number, because 2111211220221 - 2²⁹ = 2110674349309 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 = 2111211220194 and 2111211220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111211220201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117289512226 + ... + 117289512243.

Almost surely, 2^{2111211220221} is an apocalyptic number.

It is an amenable number.

2111211220221 is a deficient number, since it is larger than the sum of its proper divisors (938316097889).

2111211220221 is a wasteful number, since it uses less digits than its factorization.

2111211220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234579024475 (or 234579024472 counting only the distinct ones).

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

Adding to 2111211220221 its reverse (1220221121112), we get a palindrome (3331432341333).

The spelling of 2111211220221 in words is "two trillion, one hundred eleven billion, two hundred eleven million, two hundred twenty thousand, two hundred twenty-one".