20012120220121 has 4 divisors (see below), whose sum is σ = 20012141676544. Its totient is φ = 20012098763700.

The previous prime is 20012120220097. The next prime is 20012120220139. The reversal of 20012120220121 is 12102202121002.

It is a happy number.

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 20012120220121 - 2¹⁹ = 20012119695833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20012120220095 and 20012120220104.

It is not an unprimeable number, because it can be changed into a prime (20012120280121) 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, 9262425 + ... + 11216806.

It is an arithmetic number, because the mean of its divisors is an integer number (5003035419136).

Almost surely, 2^{20012120220121} is an apocalyptic number.

It is an amenable number.

20012120220121 is a deficient number, since it is larger than the sum of its proper divisors (21456423).

20012120220121 is an equidigital number, since it uses as much as digits as its factorization.

20012120220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21456422.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20012120220121 its reverse (12102202121002), we get a palindrome (32114322341123).

The spelling of 20012120220121 in words is "twenty trillion, twelve billion, one hundred twenty million, two hundred twenty thousand, one hundred twenty-one".