20410421121121 has 4 divisors (see below), whose sum is σ = 20410490287152. Its totient is φ = 20410351955092.

The previous prime is 20410421121113. The next prime is 20410421121161. The reversal of 20410421121121 is 12112112401402.

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 20410421121121 - 2³ = 20410421121113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20410421121092 and 20410421121101.

It is not an unprimeable number, because it can be changed into a prime (20410421121161) 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, 34138471 + ... + 34731196.

It is an arithmetic number, because the mean of its divisors is an integer number (5102622571788).

Almost surely, 2^{20410421121121} is an apocalyptic number.

It is an amenable number.

20410421121121 is a deficient number, since it is larger than the sum of its proper divisors (69166031).

20410421121121 is an equidigital number, since it uses as much as digits as its factorization.

20410421121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69166030.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 20410421121121 its reverse (12112112401402), we get a palindrome (32522533522523).

The spelling of 20410421121121 in words is "twenty trillion, four hundred ten billion, four hundred twenty-one million, one hundred twenty-one thousand, one hundred twenty-one".