20310121121 has 4 divisors (see below), whose sum is σ = 20385623700. Its totient is φ = 20234618544.

The previous prime is 20310121103. The next prime is 20310121123. The reversal of 20310121121 is 12112101302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1448944225 + 18861176896 = 38065^2 + 137336^2 .

It is a cyclic number.

It is not a de Polignac number, because 20310121121 - 2¹⁸ = 20309858977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20310121096 and 20310121105.

It is not an unprimeable number, because it can be changed into a prime (20310121123) 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, 37750886 + ... + 37751423.

It is an arithmetic number, because the mean of its divisors is an integer number (5096405925).

Almost surely, 2^20310121121 is an apocalyptic number.

It is an amenable number.

20310121121 is a deficient number, since it is larger than the sum of its proper divisors (75502579).

20310121121 is an equidigital number, since it uses as much as digits as its factorization.

20310121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75502578.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20310121121 its reverse (12112101302), we get a palindrome (32422222423).

The spelling of 20310121121 in words is "twenty billion, three hundred ten million, one hundred twenty-one thousand, one hundred twenty-one".