20111121111222 has 48 divisors (see below), whose sum is σ = 43824963237120. Its totient is φ = 6665191542576.

The previous prime is 20111121111217. The next prime is 20111121111223. The reversal of 20111121111222 is 22211112111102.

It is a happy number.

20111121111222 is a `hidden beast` number, since 201 + 11 + 121 + 111 + 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 = 20111121111195 and 20111121111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111121111223) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 276322 + ... + 6348117.

It is an arithmetic number, because the mean of its divisors is an integer number (913020067440).

Almost surely, 2^{20111121111222} is an apocalyptic number.

20111121111222 is an abundant number, since it is smaller than the sum of its proper divisors (23713842125898).

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

20111121111222 is a wasteful number, since it uses less digits than its factorization.

20111121111222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6625417 (or 6625414 counting only the distinct ones).

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

Adding to 20111121111222 its reverse (22211112111102), we get a palindrome (42322233222324).

The spelling of 20111121111222 in words is "twenty trillion, one hundred eleven billion, one hundred twenty-one million, one hundred eleven thousand, two hundred twenty-two".