20122120210121 has 4 divisors (see below), whose sum is σ = 20122131397632. Its totient is φ = 20122109022612.

The previous prime is 20122120210117. The next prime is 20122120210123. The reversal of 20122120210121 is 12101202122102.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20122120210121 - 2² = 20122120210117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20122120210121.

It is not an unprimeable number, because it can be changed into a prime (20122120210123) 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, 2215901 + ... + 6719706.

It is an arithmetic number, because the mean of its divisors is an integer number (5030532849408).

Almost surely, 2^{20122120210121} is an apocalyptic number.

It is an amenable number.

20122120210121 is a deficient number, since it is larger than the sum of its proper divisors (11187511).

20122120210121 is an equidigital number, since it uses as much as digits as its factorization.

20122120210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11187510.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20122120210121 its reverse (12101202122102), we get a palindrome (32223322332223).

The spelling of 20122120210121 in words is "twenty trillion, one hundred twenty-two billion, one hundred twenty million, two hundred ten thousand, one hundred twenty-one".