211021221222 has 320 divisors, whose sum is σ = 561240700416. Its totient is φ = 58027622400.

The previous prime is 211021221211. The next prime is 211021221241. The reversal of 211021221222 is 222122120112.

It is a happy number.

211021221222 is a `hidden beast` number, since 211 + 0 + 212 + 21 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 211021221195 and 211021221204.

It is a congruent number.

It is an unprimeable number.

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 159 ways as a sum of consecutive naturals, for example, 821094118 + ... + 821094374.

Almost surely, 2^211021221222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211021221222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280620350208).

211021221222 is an abundant number, since it is smaller than the sum of its proper divisors (350219479194).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211021221222 is a wasteful number, since it uses less digits than its factorization.

211021221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553 (or 544 counting only the distinct ones).

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

Adding to 211021221222 its reverse (222122120112), we get a palindrome (433143341334).

The spelling of 211021221222 in words is "two hundred eleven billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-two".