20111111212122 has 48 divisors (see below), whose sum is σ = 49802739772032. Its totient is φ = 5745593576160.

The previous prime is 20111111212117. The next prime is 20111111212187. The reversal of 20111111212122 is 22121211111102.

It is a happy number.

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 = 20111111212095 and 20111111212104.

It is an unprimeable number.

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, 4425529 + ... + 7733532.

It is an arithmetic number, because the mean of its divisors is an integer number (1037557078584).

Almost surely, 2^{20111111212122} is an apocalyptic number.

20111111212122 is an abundant number, since it is smaller than the sum of its proper divisors (29691628559910).

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

20111111212122 is a wasteful number, since it uses less digits than its factorization.

20111111212122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12172203 (or 12172200 counting only the distinct ones).

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

Adding to 20111111212122 its reverse (22121211111102), we get a palindrome (42232322323224).

The spelling of 20111111212122 in words is "twenty trillion, one hundred eleven billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty-two".