20542130121 has 4 divisors (see below), whose sum is σ = 27389506832. Its totient is φ = 13694753412.

The previous prime is 20542130111. The next prime is 20542130131. The reversal of 20542130121 is 12103124502.

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 an interprime number because it is at equal distance from previous prime (20542130111) and next prime (20542130131).

It is not a de Polignac number, because 20542130121 - 2¹¹ = 20542128073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20542130111) 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, 3423688351 + ... + 3423688356.

It is an arithmetic number, because the mean of its divisors is an integer number (6847376708).

Almost surely, 2^20542130121 is an apocalyptic number.

It is an amenable number.

20542130121 is a deficient number, since it is larger than the sum of its proper divisors (6847376711).

20542130121 is an equidigital number, since it uses as much as digits as its factorization.

20542130121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6847376710.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 20542130121 its reverse (12103124502), we get a palindrome (32645254623).

The spelling of 20542130121 in words is "twenty billion, five hundred forty-two million, one hundred thirty thousand, one hundred twenty-one".