21543523210 has 64 divisors (see below), whose sum is σ = 43529768064. Its totient is φ = 7609888000.

The previous prime is 21543523193. The next prime is 21543523223. The reversal of 21543523210 is 1232534512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 570537 + ... + 607123.

It is an arithmetic number, because the mean of its divisors is an integer number (680152626).

Almost surely, 2^21543523210 is an apocalyptic number.

21543523210 is an abundant number, since it is smaller than the sum of its proper divisors (21986244854).

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

21543523210 is a wasteful number, since it uses less digits than its factorization.

21543523210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36759.

The product of its (nonzero) digits is 7200, while the sum is 28.

The spelling of 21543523210 in words is "twenty-one billion, five hundred forty-three million, five hundred twenty-three thousand, two hundred ten".