21241423555 has 24 divisors (see below), whose sum is σ = 28052892000. Its totient is φ = 15428856960.

The previous prime is 21241423453. The next prime is 21241423561. The reversal of 21241423555 is 55532414212.

It is a happy number.

It is not a de Polignac number, because 21241423555 - 2⁹ = 21241423043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21241423555.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 467746 + ... + 511144.

It is an arithmetic number, because the mean of its divisors is an integer number (1168870500).

Almost surely, 2^21241423555 is an apocalyptic number.

21241423555 is a deficient number, since it is larger than the sum of its proper divisors (6811468445).

21241423555 is a wasteful number, since it uses less digits than its factorization.

21241423555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44235 (or 44224 counting only the distinct ones).

The product of its digits is 48000, while the sum is 34.

Adding to 21241423555 its reverse (55532414212), we get a palindrome (76773837767).

The spelling of 21241423555 in words is "twenty-one billion, two hundred forty-one million, four hundred twenty-three thousand, five hundred fifty-five".