211201221222 has 48 divisors (see below), whose sum is σ = 471475799808. Its totient is φ = 68297696640.

The previous prime is 211201221221. The next prime is 211201221263. The reversal of 211201221222 is 222122102112.

It is a happy number.

211201221222 is a `hidden beast` number, since 21 + 1 + 201 + 221 + 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 = 211201221195 and 211201221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211201221221) 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, 1237318 + ... + 1397625.

It is an arithmetic number, because the mean of its divisors is an integer number (9822412496).

Almost surely, 2^211201221222 is an apocalyptic number.

211201221222 is an abundant number, since it is smaller than the sum of its proper divisors (260274578586).

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

211201221222 is a wasteful number, since it uses less digits than its factorization.

211201221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2635085 (or 2635082 counting only the distinct ones).

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

Adding to 211201221222 its reverse (222122102112), we get a palindrome (433323323334).

The spelling of 211201221222 in words is "two hundred eleven billion, two hundred one million, two hundred twenty-one thousand, two hundred twenty-two".