21424203331 has 4 divisors (see below), whose sum is σ = 22551793000. Its totient is φ = 20296613664.

The previous prime is 21424203289. The next prime is 21424203377. The reversal of 21424203331 is 13330242412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21424203331 - 2¹¹ = 21424201283 is a prime.

It is a super-3 number, since 3×21424203331³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21424203296 and 21424203305.

It is not an unprimeable number, because it can be changed into a prime (21424203391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 563794806 + ... + 563794843.

It is an arithmetic number, because the mean of its divisors is an integer number (5637948250).

Almost surely, 2^21424203331 is an apocalyptic number.

21424203331 is a deficient number, since it is larger than the sum of its proper divisors (1127589669).

21424203331 is a wasteful number, since it uses less digits than its factorization.

21424203331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127589668.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21424203331 its reverse (13330242412), we get a palindrome (34754445743).

The spelling of 21424203331 in words is "twenty-one billion, four hundred twenty-four million, two hundred three thousand, three hundred thirty-one".