21440013424524 has 18 divisors (see below), whose sum is σ = 54195589489860. Its totient is φ = 7146671141496.

The previous prime is 21440013424519. The next prime is 21440013424567. The reversal of 21440013424524 is 42542431004412.

21440013424524 is a `hidden beast` number, since 2 + 1 + 4 + 400 + 1 + 3 + 4 + 245 + 2 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 595555928459 = 21440013424524 / (2 + 1 + 4 + 4 + 0 + 0 + 1 + 3 + 4 + 2 + 4 + 5 + 2 + 4).

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, 297777964194 + ... + 297777964265.

It is an arithmetic number, because the mean of its divisors is an integer number (3010866082770).

Almost surely, 2^{21440013424524} is an apocalyptic number.

It is an amenable number.

21440013424524 is an abundant number, since it is smaller than the sum of its proper divisors (32755576065336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21440013424524 is a wasteful number, since it uses less digits than its factorization.

21440013424524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595555928469 (or 595555928464 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 36.

Adding to 21440013424524 its reverse (42542431004412), we get a palindrome (63982444428936).

The spelling of 21440013424524 in words is "twenty-one trillion, four hundred forty billion, thirteen million, four hundred twenty-four thousand, five hundred twenty-four".