20123302121 has 4 divisors (see below), whose sum is σ = 21671248452. Its totient is φ = 18575355792.

The previous prime is 20123302093. The next prime is 20123302151. The reversal of 20123302121 is 12120332102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12120332102 = 2 ⋅6060166051.

It can be written as a sum of positive squares in 2 ways, for example, as 9319778521 + 10803523600 = 96539^2 + 103940^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123302121 - 2⁶ = 20123302057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20123302121.

It is not an unprimeable number, because it can be changed into a prime (20123302151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773973146 + ... + 773973171.

It is an arithmetic number, because the mean of its divisors is an integer number (5417812113).

Almost surely, 2^20123302121 is an apocalyptic number.

It is an amenable number.

20123302121 is a deficient number, since it is larger than the sum of its proper divisors (1547946331).

20123302121 is a wasteful number, since it uses less digits than its factorization.

20123302121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547946330.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20123302121 its reverse (12120332102), we get a palindrome (32243634223).

The spelling of 20123302121 in words is "twenty billion, one hundred twenty-three million, three hundred two thousand, one hundred twenty-one".