211222122221 has 16 divisors (see below), whose sum is σ = 231572030976. Its totient is φ = 191065710000.

The previous prime is 211222122203. The next prime is 211222122247. The reversal of 211222122221 is 122221222112.

It is not a de Polignac number, because 211222122221 - 2²² = 211217927917 is a prime.

It is a super-2 number, since 2×211222122221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211222122193 and 211222122202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211222122281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1899326 + ... + 2007456.

It is an arithmetic number, because the mean of its divisors is an integer number (14473251936).

Almost surely, 2^211222122221 is an apocalyptic number.

It is an amenable number.

211222122221 is a deficient number, since it is larger than the sum of its proper divisors (20349908755).

211222122221 is a wasteful number, since it uses less digits than its factorization.

211222122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109024.

The product of its digits is 256, while the sum is 20.

Adding to 211222122221 its reverse (122221222112), we get a palindrome (333443344333).

The spelling of 211222122221 in words is "two hundred eleven billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred twenty-one".