211222201221 has 24 divisors (see below), whose sum is σ = 321211194720. Its totient is φ = 133380802656.

The previous prime is 211222201207. The next prime is 211222201237. The reversal of 211222201221 is 122102222112.

It is a happy number.

211222201221 is a `hidden beast` number, since 21 + 1 + 222 + 201 + 221 = 666.

It is not a de Polignac number, because 211222201221 - 2¹³ = 211222193029 is a prime.

It is a super-2 number, since 2×211222201221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211222201194 and 211222201203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211222201261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 933030 + ... + 1137096.

It is an arithmetic number, because the mean of its divisors is an integer number (13383799780).

Almost surely, 2^211222201221 is an apocalyptic number.

It is an amenable number.

211222201221 is a deficient number, since it is larger than the sum of its proper divisors (109988993499).

211222201221 is a wasteful number, since it uses less digits than its factorization.

211222201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210145 (or 210142 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 211222201221 its reverse (122102222112), we get a palindrome (333324423333).

The spelling of 211222201221 in words is "two hundred eleven billion, two hundred twenty-two million, two hundred one thousand, two hundred twenty-one".