20012021211121 has 4 divisors (see below), whose sum is σ = 20437808896512. Its totient is φ = 19586233525732.

The previous prime is 20012021211053. The next prime is 20012021211139. The reversal of 20012021211121 is 12111212021002.

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 20012021211121 - 2¹¹ = 20012021209073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20012021211095 and 20012021211104.

It is not an unprimeable number, because it can be changed into a prime (20012021211191) 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, 212893842625 + ... + 212893842718.

It is an arithmetic number, because the mean of its divisors is an integer number (5109452224128).

Almost surely, 2^{20012021211121} is an apocalyptic number.

It is an amenable number.

20012021211121 is a deficient number, since it is larger than the sum of its proper divisors (425787685391).

20012021211121 is an equidigital number, since it uses as much as digits as its factorization.

20012021211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425787685390.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20012021211121 its reverse (12111212021002), we get a palindrome (32123233232123).

The spelling of 20012021211121 in words is "twenty trillion, twelve billion, twenty-one million, two hundred eleven thousand, one hundred twenty-one".