11111011221222 has 96 divisors (see below), whose sum is σ = 27809288885664. Its totient is φ = 3168681984000.

The previous prime is 11111011221169. The next prime is 11111011221257. The reversal of 11111011221222 is 22212211011111.

It is a happy number.

11111011221222 is a `hidden beast` number, since 111 + 110 + 1 + 1 + 221 + 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 = 11111011221195 and 11111011221204.

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, 48359158 + ... + 48588374.

It is an arithmetic number, because the mean of its divisors is an integer number (289680092559).

Almost surely, 2^{11111011221222} is an apocalyptic number.

11111011221222 is an abundant number, since it is smaller than the sum of its proper divisors (16698277664442).

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

11111011221222 is a wasteful number, since it uses less digits than its factorization.

11111011221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243654 (or 243651 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 11111011221222 its reverse (22212211011111), we get a palindrome (33323222232333).

The spelling of 11111011221222 in words is "eleven trillion, one hundred eleven billion, eleven million, two hundred twenty-one thousand, two hundred twenty-two".