21043224575 has 6 divisors (see below), whose sum is σ = 26093598504. Its totient is φ = 16834579640.

The previous prime is 21043224533. The next prime is 21043224583. The reversal of 21043224575 is 57542234012.

It is not a de Polignac number, because 21043224575 - 2⁶ = 21043224511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 420864467 + ... + 420864516.

It is an arithmetic number, because the mean of its divisors is an integer number (4348933084).

Almost surely, 2^21043224575 is an apocalyptic number.

21043224575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21043224575 is a deficient number, since it is larger than the sum of its proper divisors (5050373929).

21043224575 is an equidigital number, since it uses as much as digits as its factorization.

21043224575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841728993 (or 841728988 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 35.

Adding to 21043224575 its reverse (57542234012), we get a palindrome (78585458587).

The spelling of 21043224575 in words is "twenty-one billion, forty-three million, two hundred twenty-four thousand, five hundred seventy-five".