21230112421 has 32 divisors (see below), whose sum is σ = 25004851200. Its totient is φ = 17651779200.

The previous prime is 21230112401. The next prime is 21230112467. The reversal of 21230112421 is 12421103212.

It is a de Polignac number, because none of the positive numbers 2^k-21230112421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230112401) 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 31 ways as a sum of consecutive naturals, for example, 7806700 + ... + 7809418.

It is an arithmetic number, because the mean of its divisors is an integer number (781401600).

Almost surely, 2^21230112421 is an apocalyptic number.

It is an amenable number.

21230112421 is a deficient number, since it is larger than the sum of its proper divisors (3774738779).

21230112421 is a wasteful number, since it uses less digits than its factorization.

21230112421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3049.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21230112421 its reverse (12421103212), we get a palindrome (33651215633).

The spelling of 21230112421 in words is "twenty-one billion, two hundred thirty million, one hundred twelve thousand, four hundred twenty-one".