211212120100221 has 32 divisors (see below), whose sum is σ = 314109247795200. Its totient is φ = 140268028304880.

The previous prime is 211212120100181. The next prime is 211212120100253. The reversal of 211212120100221 is 122001021212112.

211212120100221 is a `hidden beast` number, since 2 + 11 + 212 + 120 + 100 + 221 = 666.

It is not a de Polignac number, because 211212120100221 - 2²⁷ = 211211985882493 is a prime.

It is a super-2 number, since 2×211212120100221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211212120100194 and 211212120100203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212120100321) 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, 6915831 + ... + 21685316.

It is an arithmetic number, because the mean of its divisors is an integer number (9815913993600).

Almost surely, 2^{211212120100221} is an apocalyptic number.

It is an amenable number.

211212120100221 is a deficient number, since it is larger than the sum of its proper divisors (102897127694979).

211212120100221 is a wasteful number, since it uses less digits than its factorization.

211212120100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28602206 (or 28602200 counting only the distinct ones).

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

Adding to 211212120100221 its reverse (122001021212112), we get a palindrome (333213141312333).

The spelling of 211212120100221 in words is "two hundred eleven trillion, two hundred twelve billion, one hundred twenty million, one hundred thousand, two hundred twenty-one".