1211011320222 has 192 divisors, whose sum is σ = 2939719910400. Its totient is φ = 357209948160.

The previous prime is 1211011320217. The next prime is 1211011320287. The reversal of 1211011320222 is 2220231101121.

1211011320222 is a `hidden beast` number, since 1 + 2 + 110 + 11 + 320 + 222 = 666.

It is a super-2 number, since 2×1211011320222² (a number of 25 digits) contains 22 as substring.

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 = 1211011320195 and 1211011320204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1050312798 + ... + 1050313950.

It is an arithmetic number, because the mean of its divisors is an integer number (15311041200).

Almost surely, 2^{1211011320222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211011320222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1469859955200).

1211011320222 is an abundant number, since it is smaller than the sum of its proper divisors (1728708590178).

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

1211011320222 is a wasteful number, since it uses less digits than its factorization.

1211011320222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143 (or 2140 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1211011320222 its reverse (2220231101121), we get a palindrome (3431242421343).

The spelling of 1211011320222 in words is "one trillion, two hundred eleven billion, eleven million, three hundred twenty thousand, two hundred twenty-two".