21524440043 has 8 divisors (see below), whose sum is σ = 21815164800. Its totient is φ = 21235411008.

The previous prime is 21524440031. The next prime is 21524440057. The reversal of 21524440043 is 34004442512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21524440043 - 2¹⁰ = 21524439019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21524439988 and 21524440015.

It is not an unprimeable number, because it can be changed into a prime (21524440013) 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 7 ways as a sum of consecutive naturals, for example, 398363 + ... + 449156.

It is an arithmetic number, because the mean of its divisors is an integer number (2726895600).

Almost surely, 2^21524440043 is an apocalyptic number.

21524440043 is a deficient number, since it is larger than the sum of its proper divisors (290724757).

21524440043 is a wasteful number, since it uses less digits than its factorization.

21524440043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847861.

The product of its (nonzero) digits is 15360, while the sum is 29.

Adding to 21524440043 its reverse (34004442512), we get a palindrome (55528882555).

The spelling of 21524440043 in words is "twenty-one billion, five hundred twenty-four million, four hundred forty thousand, forty-three".