20121021112122 has 48 divisors (see below), whose sum is σ = 49828875300672. Its totient is φ = 5748240738240.

The previous prime is 20121021112103. The next prime is 20121021112123. The reversal of 20121021112122 is 22121112012102.

20121021112122 is a `hidden beast` number, since 201 + 210 + 21 + 112 + 122 = 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 = 20121021112095 and 20121021112104.

It is not an unprimeable number, because it can be changed into a prime (20121021112123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7475968 + ... + 9804699.

It is an arithmetic number, because the mean of its divisors is an integer number (1038101568764).

Almost surely, 2^{20121021112122} is an apocalyptic number.

20121021112122 is an abundant number, since it is smaller than the sum of its proper divisors (29707854188550).

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

20121021112122 is a wasteful number, since it uses less digits than its factorization.

20121021112122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17289923 (or 17289920 counting only the distinct ones).

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

Adding to 20121021112122 its reverse (22121112012102), we get a palindrome (42242133124224).

The spelling of 20121021112122 in words is "twenty trillion, one hundred twenty-one billion, twenty-one million, one hundred twelve thousand, one hundred twenty-two".