20120120200121 has 4 divisors (see below), whose sum is σ = 20120562222672. Its totient is φ = 20119678177572.

The previous prime is 20120120200111. The next prime is 20120120200123. The reversal of 20120120200121 is 12100202102102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20120120200121 - 2¹⁰ = 20120120199097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20120120200096 and 20120120200105.

It is not an unprimeable number, because it can be changed into a prime (20120120200123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220942991 + ... + 221034036.

It is an arithmetic number, because the mean of its divisors is an integer number (5030140555668).

Almost surely, 2^{20120120200121} is an apocalyptic number.

It is an amenable number.

20120120200121 is a deficient number, since it is larger than the sum of its proper divisors (442022551).

20120120200121 is an equidigital number, since it uses as much as digits as its factorization.

20120120200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442022550.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20120120200121 its reverse (12100202102102), we get a palindrome (32220322302223).

The spelling of 20120120200121 in words is "twenty trillion, one hundred twenty billion, one hundred twenty million, two hundred thousand, one hundred twenty-one".