21542431110 has 128 divisors (see below), whose sum is σ = 56137618944. Its totient is φ = 5269555200.

The previous prime is 21542431087. The next prime is 21542431117. The reversal of 21542431110 is 1113424512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21542431117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14845885 + ... + 14847335.

It is an arithmetic number, because the mean of its divisors is an integer number (438575148).

Almost surely, 2^21542431110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21542431110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28068809472).

21542431110 is an abundant number, since it is smaller than the sum of its proper divisors (34595187834).

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

21542431110 is a wasteful number, since it uses less digits than its factorization.

21542431110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2198.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21542431110 its reverse (1113424512), we get a palindrome (22655855622).

The spelling of 21542431110 in words is "twenty-one billion, five hundred forty-two million, four hundred thirty-one thousand, one hundred ten".