20001221120122 has 16 divisors (see below), whose sum is σ = 32918457467232. Its totient is φ = 9038912327920.

The previous prime is 20001221120117. The next prime is 20001221120129. The reversal of 20001221120122 is 22102112210002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20001221120096 and 20001221120105.

It is not an unprimeable number, because it can be changed into a prime (20001221120129) 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, 2627586988 + ... + 2627594599.

It is an arithmetic number, because the mean of its divisors is an integer number (2057403591702).

Almost surely, 2^{20001221120122} is an apocalyptic number.

20001221120122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20001221120122 is a deficient number, since it is larger than the sum of its proper divisors (12917236347110).

20001221120122 is a wasteful number, since it uses less digits than its factorization.

20001221120122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5255181773.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20001221120122 its reverse (22102112210002), we get a palindrome (42103333330124).

The spelling of 20001221120122 in words is "twenty trillion, one billion, two hundred twenty-one million, one hundred twenty thousand, one hundred twenty-two".