20104134121 has 4 divisors (see below), whose sum is σ = 20142574672. Its totient is φ = 20065693572.

The previous prime is 20104134103. The next prime is 20104134131. The reversal of 20104134121 is 12143140102.

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 an emirpimes, since its reverse is a distinct semiprime: 12143140102 = 2 ⋅6071570051.

It is a cyclic number.

It is not a de Polignac number, because 20104134121 - 2²⁵ = 20070579689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20104134131) 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, 19219491 + ... + 19220536.

It is an arithmetic number, because the mean of its divisors is an integer number (5035643668).

Almost surely, 2^20104134121 is an apocalyptic number.

It is an amenable number.

20104134121 is a deficient number, since it is larger than the sum of its proper divisors (38440551).

20104134121 is an equidigital number, since it uses as much as digits as its factorization.

20104134121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38440550.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 20104134121 its reverse (12143140102), we get a palindrome (32247274223).

The spelling of 20104134121 in words is "twenty billion, one hundred four million, one hundred thirty-four thousand, one hundred twenty-one".