20011221112122 has 16 divisors (see below), whose sum is σ = 44469380249280. Its totient is φ = 6670407037356.

The previous prime is 20011221112109. The next prime is 20011221112123. The reversal of 20011221112122 is 22121112211002.

20011221112122 is a `hidden beast` number, since 200 + 11 + 221 + 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 = 20011221112095 and 20011221112104.

It is not an unprimeable number, because it can be changed into a prime (20011221112123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185289084318 + ... + 185289084425.

It is an arithmetic number, because the mean of its divisors is an integer number (2779336265580).

Almost surely, 2^{20011221112122} is an apocalyptic number.

20011221112122 is an abundant number, since it is smaller than the sum of its proper divisors (24458159137158).

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

20011221112122 is a wasteful number, since it uses less digits than its factorization.

20011221112122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370578168754 (or 370578168748 counting only the distinct ones).

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

Adding to 20011221112122 its reverse (22121112211002), we get a palindrome (42132333323124).

The spelling of 20011221112122 in words is "twenty trillion, eleven billion, two hundred twenty-one million, one hundred twelve thousand, one hundred twenty-two".