21424231233 has 12 divisors (see below), whose sum is σ = 30950599680. Its totient is φ = 14280749496.

The previous prime is 21424231219. The next prime is 21424231243. The reversal of 21424231233 is 33213242412.

21424231233 is a `hidden beast` number, since 2 + 1 + 4 + 2 + 423 + 1 + 233 = 666.

It is not a de Polignac number, because 21424231233 - 2⁹ = 21424230721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21424231197 and 21424231206.

It is not an unprimeable number, because it can be changed into a prime (21424231243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105741 + ... + 232442.

It is an arithmetic number, because the mean of its divisors is an integer number (2579216640).

Almost surely, 2^21424231233 is an apocalyptic number.

It is an amenable number.

21424231233 is a deficient number, since it is larger than the sum of its proper divisors (9526368447).

21424231233 is a wasteful number, since it uses less digits than its factorization.

21424231233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345228 (or 345225 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

Adding to 21424231233 its reverse (33213242412), we get a palindrome (54637473645).

The spelling of 21424231233 in words is "twenty-one billion, four hundred twenty-four million, two hundred thirty-one thousand, two hundred thirty-three".