21243524522 has 64 divisors (see below), whose sum is σ = 37517990400. Its totient is φ = 8917231680.

The previous prime is 21243524509. The next prime is 21243524527. The reversal of 21243524522 is 22542534212.

It is not an unprimeable number, because it can be changed into a prime (21243524527) 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 31 ways as a sum of consecutive naturals, for example, 12742733 + ... + 12744399.

It is an arithmetic number, because the mean of its divisors is an integer number (586218600).

Almost surely, 2^21243524522 is an apocalyptic number.

21243524522 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21243524522 is a deficient number, since it is larger than the sum of its proper divisors (16274465878).

21243524522 is a wasteful number, since it uses less digits than its factorization.

21243524522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2451.

The product of its digits is 38400, while the sum is 32.

The spelling of 21243524522 in words is "twenty-one billion, two hundred forty-three million, five hundred twenty-four thousand, five hundred twenty-two".