1211222100222 has 160 divisors (see below), whose sum is σ = 2888978827680. Its totient is φ = 378668908800.

The previous prime is 1211222100211. The next prime is 1211222100239. The reversal of 1211222100222 is 2220012221121.

It is a happy number.

1211222100222 is a `hidden beast` number, since 1 + 211 + 22 + 210 + 0 + 222 = 666.

It is a super-2 number, since 2×1211222100222² (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 = 1211222100195 and 1211222100204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 25124313 + ... + 25172475.

It is an arithmetic number, because the mean of its divisors is an integer number (18056117673).

Almost surely, 2^{1211222100222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211222100222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1444489413840).

1211222100222 is an abundant number, since it is smaller than the sum of its proper divisors (1677756727458).

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

1211222100222 is a wasteful number, since it uses less digits than its factorization.

1211222100222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48360 (or 48351 counting only the distinct ones).

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

Adding to 1211222100222 its reverse (2220012221121), we get a palindrome (3431234321343).

The spelling of 1211222100222 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred thousand, two hundred twenty-two".