11111222212222 has 16 divisors (see below), whose sum is σ = 18182071875312. Its totient is φ = 5050535581120.

The previous prime is 11111222212219. The next prime is 11111222212247. The reversal of 11111222212222 is 22221222211111.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 11111222212193 and 11111222212202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5686548 + ... + 7386424.

It is an arithmetic number, because the mean of its divisors is an integer number (1136379492207).

Almost surely, 2^{11111222212222} is an apocalyptic number.

11111222212222 is a deficient number, since it is larger than the sum of its proper divisors (7070849663090).

11111222212222 is a wasteful number, since it uses less digits than its factorization.

11111222212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1997003.

The product of its digits is 256, while the sum is 22.

Adding to 11111222212222 its reverse (22221222211111), we get a palindrome (33332444423333).

It can be divided in two parts, 11111 and 222212222, that multiplied together give a palindrome (2468999998642).

The spelling of 11111222212222 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-two million, two hundred twelve thousand, two hundred twenty-two".