1211211021222 has 96 divisors (see below), whose sum is σ = 2740750927200. Its totient is φ = 386238150144.

The previous prime is 1211211021197. The next prime is 1211211021287. The reversal of 1211211021222 is 2221201121121.

1211211021222 is a `hidden beast` number, since 1 + 211 + 211 + 0 + 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 = 1211211021195 and 1211211021204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10552968 + ... + 10667124.

It is an arithmetic number, because the mean of its divisors is an integer number (28549488825).

Almost surely, 2^{1211211021222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211211021222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1370375463600).

1211211021222 is an abundant number, since it is smaller than the sum of its proper divisors (1529539905978).

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

1211211021222 is a wasteful number, since it uses less digits than its factorization.

1211211021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114470 (or 114467 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1211211021222 its reverse (2221201121121), we get a palindrome (3432412142343).

The spelling of 1211211021222 in words is "one trillion, two hundred eleven billion, two hundred eleven million, twenty-one thousand, two hundred twenty-two".