21542431112 has 16 divisors (see below), whose sum is σ = 40393881360. Its totient is φ = 10770729424.

The previous prime is 21542431087. The next prime is 21542431117. The reversal of 21542431112 is 21113424512.

It is a happy number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186983 + ... + 279369.

It is an arithmetic number, because the mean of its divisors is an integer number (2524617585).

Almost surely, 2^21542431112 is an apocalyptic number.

It is an amenable number.

21542431112 is a deficient number, since it is larger than the sum of its proper divisors (18851450248).

21542431112 is a wasteful number, since it uses less digits than its factorization.

21542431112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121540 (or 121536 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

Adding to 21542431112 its reverse (21113424512), we get a palindrome (42655855624).

The spelling of 21542431112 in words is "twenty-one billion, five hundred forty-two million, four hundred thirty-one thousand, one hundred twelve".