21543234412110 has 64 divisors (see below), whose sum is σ = 51898542925824. Its totient is φ = 5723226748800.

The previous prime is 21543234412103. The next prime is 21543234412111. The reversal of 21543234412110 is 1121443234512.

It is a super-2 number, since 2×21543234412110² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21543234412111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53740515 + ... + 54139905.

It is an arithmetic number, because the mean of its divisors is an integer number (810914733216).

Almost surely, 2^{21543234412110} is an apocalyptic number.

21543234412110 is an abundant number, since it is smaller than the sum of its proper divisors (30355308513714).

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

21543234412110 is a wasteful number, since it uses less digits than its factorization.

21543234412110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406169.

The product of its (nonzero) digits is 23040, while the sum is 33.

Adding to 21543234412110 its reverse (1121443234512), we get a palindrome (22664677646622).

The spelling of 21543234412110 in words is "twenty-one trillion, five hundred forty-three billion, two hundred thirty-four million, four hundred twelve thousand, one hundred ten".