20212120222121 has 4 divisors (see below), whose sum is σ = 20267194119552. Its totient is φ = 20157046324692.

The previous prime is 20212120222087. The next prime is 20212120222193. The reversal of 20212120222121 is 12122202121202.

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 20212120222121 - 2⁶ = 20212120222057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20212120222093 and 20212120222102.

It is not an unprimeable number, because it can be changed into a prime (20212120222321) 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, 27536948165 + ... + 27536948898.

It is an arithmetic number, because the mean of its divisors is an integer number (5066798529888).

Almost surely, 2^{20212120222121} is an apocalyptic number.

It is an amenable number.

20212120222121 is a deficient number, since it is larger than the sum of its proper divisors (55073897431).

20212120222121 is an equidigital number, since it uses as much as digits as its factorization.

20212120222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55073897430.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 20212120222121 its reverse (12122202121202), we get a palindrome (32334322343323).

The spelling of 20212120222121 in words is "twenty trillion, two hundred twelve billion, one hundred twenty million, two hundred twenty-two thousand, one hundred twenty-one".