20423413121 has 4 divisors (see below), whose sum is σ = 20464016832. Its totient is φ = 20382809412.

The previous prime is 20423413099. The next prime is 20423413123. The reversal of 20423413121 is 12131432402.

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: 12131432402 = 2 ⋅6065716201.

It is a cyclic number.

It is not a de Polignac number, because 20423413121 - 2²⁶ = 20356304257 is a prime.

It is a super-2 number, since 2×20423413121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20423413123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20301101 + ... + 20302106.

It is an arithmetic number, because the mean of its divisors is an integer number (5116004208).

Almost surely, 2^20423413121 is an apocalyptic number.

It is an amenable number.

20423413121 is a deficient number, since it is larger than the sum of its proper divisors (40603711).

20423413121 is an equidigital number, since it uses as much as digits as its factorization.

20423413121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40603710.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 20423413121 its reverse (12131432402), we get a palindrome (32554845523).

The spelling of 20423413121 in words is "twenty billion, four hundred twenty-three million, four hundred thirteen thousand, one hundred twenty-one".