2111212210221 has 32 divisors (see below), whose sum is σ = 3263972555520. Its totient is φ = 1346171821632.

The previous prime is 2111212210207. The next prime is 2111212210229. The reversal of 2111212210221 is 1220122121112.

2111212210221 is a `hidden beast` number, since 21 + 1 + 1 + 212 + 210 + 221 = 666.

It is not a de Polignac number, because 2111212210221 - 2⁶ = 2111212210157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2111212210194 and 2111212210203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111212210229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7965591 + ... + 8226363.

It is an arithmetic number, because the mean of its divisors is an integer number (101999142360).

Almost surely, 2^{2111212210221} is an apocalyptic number.

It is an amenable number.

2111212210221 is a deficient number, since it is larger than the sum of its proper divisors (1152760345299).

2111212210221 is a wasteful number, since it uses less digits than its factorization.

2111212210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273842 (or 273836 counting only the distinct ones).

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

Adding to 2111212210221 its reverse (1220122121112), we get a palindrome (3331334331333).

The spelling of 2111212210221 in words is "two trillion, one hundred eleven billion, two hundred twelve million, two hundred ten thousand, two hundred twenty-one".