21241423999 has 4 divisors (see below), whose sum is σ = 21252062664. Its totient is φ = 21230785336.

The previous prime is 21241423997. The next prime is 21241424011. The reversal of 21241423999 is 99932414212.

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 21241423999 - 2¹ = 21241423997 is a prime.

It is a super-3 number, since 3×21241423999³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241423991) 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 3 ways as a sum of consecutive naturals, for example, 5316337 + ... + 5320330.

It is an arithmetic number, because the mean of its divisors is an integer number (5313015666).

Almost surely, 2^21241423999 is an apocalyptic number.

21241423999 is a deficient number, since it is larger than the sum of its proper divisors (10638665).

21241423999 is a wasteful number, since it uses less digits than its factorization.

21241423999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10638664.

The product of its digits is 279936, while the sum is 46.

The spelling of 21241423999 in words is "twenty-one billion, two hundred forty-one million, four hundred twenty-three thousand, nine hundred ninety-nine".