20001220000121 has 8 divisors (see below), whose sum is σ = 20761643086464. Its totient is φ = 19254749631120.

The previous prime is 20001220000117. The next prime is 20001220000127. The reversal of 20001220000121 is 12100002210002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20001220000121 - 2² = 20001220000117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001220000127) 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, 3488176415 + ... + 3488182148.

It is an arithmetic number, because the mean of its divisors is an integer number (2595205385808).

Almost surely, 2^{20001220000121} is an apocalyptic number.

It is an amenable number.

20001220000121 is a deficient number, since it is larger than the sum of its proper divisors (760423086343).

20001220000121 is an equidigital number, since it uses as much as digits as its factorization.

20001220000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6976358671.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20001220000121 its reverse (12100002210002), we get a palindrome (32101222210123).

The spelling of 20001220000121 in words is "twenty trillion, one billion, two hundred twenty million, one hundred twenty-one", and thus it is an aban number.