21243524458 has 16 divisors (see below), whose sum is σ = 34357992480. Its totient is φ = 9792837936.

The previous prime is 21243524453. The next prime is 21243524459. The reversal of 21243524458 is 85442534212.

It is a self number, because there is not a number n which added to its sum of digits gives 21243524458.

It is not an unprimeable number, because it can be changed into a prime (21243524453) 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, 472488 + ... + 515491.

It is an arithmetic number, because the mean of its divisors is an integer number (2147374530).

Almost surely, 2^21243524458 is an apocalyptic number.

21243524458 is a deficient number, since it is larger than the sum of its proper divisors (13114468022).

21243524458 is a wasteful number, since it uses less digits than its factorization.

21243524458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988821.

The product of its digits is 307200, while the sum is 40.

The spelling of 21243524458 in words is "twenty-one billion, two hundred forty-three million, five hundred twenty-four thousand, four hundred fifty-eight".