20000121223120 has 20 divisors (see below), whose sum is σ = 46500281843940. Its totient is φ = 8000048489216.

The previous prime is 20000121223087. The next prime is 20000121223133. The reversal of 20000121223120 is 2132212100002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5348803311504 + 14651317911616 = 2312748^2 + 3827704^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 20000121223094 and 20000121223103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125000757565 + ... + 125000757724.

It is an arithmetic number, because the mean of its divisors is an integer number (2325014092197).

Almost surely, 2^{20000121223120} is an apocalyptic number.

20000121223120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20000121223120 is an abundant number, since it is smaller than the sum of its proper divisors (26500160620820).

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

20000121223120 is a wasteful number, since it uses less digits than its factorization.

20000121223120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250001515302 (or 250001515296 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20000121223120 its reverse (2132212100002), we get a palindrome (22132333323122).

The spelling of 20000121223120 in words is "twenty trillion, one hundred twenty-one million, two hundred twenty-three thousand, one hundred twenty".