20130243421 has 16 divisors (see below), whose sum is σ = 21430064128. Its totient is φ = 18875462400.

The previous prime is 20130243403. The next prime is 20130243433. The reversal of 20130243421 is 12434203102.

It is a cyclic number.

It is not a de Polignac number, because 20130243421 - 2¹⁷ = 20130112349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20130243392 and 20130243401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20130243821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240016 + ... + 312838.

It is an arithmetic number, because the mean of its divisors is an integer number (1339379008).

Almost surely, 2^20130243421 is an apocalyptic number.

It is an amenable number.

20130243421 is a deficient number, since it is larger than the sum of its proper divisors (1299820707).

20130243421 is a wasteful number, since it uses less digits than its factorization.

20130243421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73132.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 20130243421 its reverse (12434203102), we get a palindrome (32564446523).

The spelling of 20130243421 in words is "twenty billion, one hundred thirty million, two hundred forty-three thousand, four hundred twenty-one".