20013232421 has 32 divisors (see below), whose sum is σ = 24826115328. Its totient is φ = 15710008320.

The previous prime is 20013232417. The next prime is 20013232429. The reversal of 20013232421 is 12423231002.

It is a cyclic number.

It is not a de Polignac number, because 20013232421 - 2² = 20013232417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20013232393 and 20013232402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013232429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14491151 + ... + 14492531.

It is an arithmetic number, because the mean of its divisors is an integer number (775816104).

Almost surely, 2^20013232421 is an apocalyptic number.

It is an amenable number.

20013232421 is a deficient number, since it is larger than the sum of its proper divisors (4812882907).

20013232421 is a wasteful number, since it uses less digits than its factorization.

20013232421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2541.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20013232421 its reverse (12423231002), we get a palindrome (32436463423).

The spelling of 20013232421 in words is "twenty billion, thirteen million, two hundred thirty-two thousand, four hundred twenty-one".