20121200200121 has 4 divisors (see below), whose sum is σ = 20164658516352. Its totient is φ = 20077741883892.

The previous prime is 20121200200109. The next prime is 20121200200147. The reversal of 20121200200121 is 12100200212102.

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 20121200200121 - 2¹⁰ = 20121200199097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121200200096 and 20121200200105.

It is not an unprimeable number, because it can be changed into a prime (20121200200721) 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, 21729157421 + ... + 21729158346.

It is an arithmetic number, because the mean of its divisors is an integer number (5041164629088).

Almost surely, 2^{20121200200121} is an apocalyptic number.

It is an amenable number.

20121200200121 is a deficient number, since it is larger than the sum of its proper divisors (43458316231).

20121200200121 is an equidigital number, since it uses as much as digits as its factorization.

20121200200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43458316230.

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

Adding to 20121200200121 its reverse (12100200212102), we get a palindrome (32221400412223).

The spelling of 20121200200121 in words is "twenty trillion, one hundred twenty-one billion, two hundred million, two hundred thousand, one hundred twenty-one".