221201211222 has 48 divisors (see below), whose sum is σ = 485178286320. Its totient is φ = 72825155136.

The previous prime is 221201211199. The next prime is 221201211239. The reversal of 221201211222 is 222112102122.

It is a happy number.

221201211222 is a `hidden beast` number, since 221 + 201 + 21 + 1 + 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 = 221201211195 and 221201211204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5941008 + ... + 5978124.

It is an arithmetic number, because the mean of its divisors is an integer number (10107880965).

Almost surely, 2^221201211222 is an apocalyptic number.

221201211222 is an abundant number, since it is smaller than the sum of its proper divisors (263977075098).

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

221201211222 is a wasteful number, since it uses less digits than its factorization.

221201211222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41197 (or 41194 counting only the distinct ones).

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

Adding to 221201211222 its reverse (222112102122), we get a palindrome (443313313344).

The spelling of 221201211222 in words is "two hundred twenty-one billion, two hundred one million, two hundred eleven thousand, two hundred twenty-two".