1211220211122 has 24 divisors (see below), whose sum is σ = 2624547975660. Its totient is φ = 403703529120.

The previous prime is 1211220211073. The next prime is 1211220211127. The reversal of 1211220211122 is 2211120221121.

1211220211122 is a `hidden beast` number, since 1 + 211 + 220 + 211 + 1 + 22 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1189825005681 + 21395205441 = 1090791^2 + 146271^2 .

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 = 1211220211095 and 1211220211104.

It is not an unprimeable number, because it can be changed into a prime (1211220211127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2840329 + ... + 3238812.

Almost surely, 2^{1211220211122} is an apocalyptic number.

1211220211122 is an abundant number, since it is smaller than the sum of its proper divisors (1413327764538).

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

1211220211122 is a wasteful number, since it uses less digits than its factorization.

1211220211122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6090218 (or 6090215 counting only the distinct ones).

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

Adding to 1211220211122 its reverse (2211120221121), we get a palindrome (3422340432243).

Subtracting 1211220211122 from its reverse (2211120221121), we obtain a palindrome (999900009999).

The spelling of 1211220211122 in words is "one trillion, two hundred eleven billion, two hundred twenty million, two hundred eleven thousand, one hundred twenty-two".