20121111012222 has 64 divisors (see below), whose sum is σ = 48826227582720. Its totient is φ = 6091334287200.

The previous prime is 20121111012139. The next prime is 20121111012241. The reversal of 20121111012222 is 22221011112102.

20121111012222 is a `hidden beast` number, since 201 + 211 + 110 + 122 + 22 = 666.

It is a super-2 number, since 2×20121111012222² (a number of 27 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 = 20121111012195 and 20121111012204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15982128 + ... + 17195075.

It is an arithmetic number, because the mean of its divisors is an integer number (762909805980).

Almost surely, 2^{20121111012222} is an apocalyptic number.

20121111012222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20121111012222 is an abundant number, since it is smaller than the sum of its proper divisors (28705116570498).

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

20121111012222 is a wasteful number, since it uses less digits than its factorization.

20121111012222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33178246 (or 33178240 counting only the distinct ones).

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

Adding to 20121111012222 its reverse (22221011112102), we get a palindrome (42342122124324).

The spelling of 20121111012222 in words is "twenty trillion, one hundred twenty-one billion, one hundred eleven million, twelve thousand, two hundred twenty-two".