201211111210221 has 12 divisors (see below), whose sum is σ = 332158024855072. Its totient is φ = 114977777834376.

The previous prime is 201211111210163. The next prime is 201211111210247. The reversal of 201211111210221 is 122012111112102.

It is a happy number.

201211111210221 is a `hidden beast` number, since 2 + 0 + 121 + 1 + 111 + 210 + 221 = 666.

It is not a de Polignac number, because 201211111210221 - 2¹³ = 201211111202029 is a prime.

It is a super-2 number, since 2×201211111210221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201211111210194 and 201211111210203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211111210271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1596913580971 + ... + 1596913581096.

Almost surely, 2^{201211111210221} is an apocalyptic number.

201211111210221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

201211111210221 is a deficient number, since it is larger than the sum of its proper divisors (130946913644851).

201211111210221 is a wasteful number, since it uses less digits than its factorization.

201211111210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3193827162080 (or 3193827162077 counting only the distinct ones).

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

Adding to 201211111210221 its reverse (122012111112102), we get a palindrome (323223222322323).

The spelling of 201211111210221 in words is "two hundred one trillion, two hundred eleven billion, one hundred eleven million, two hundred ten thousand, two hundred twenty-one".