21110123424 has 48 divisors (see below), whose sum is σ = 59676698592. Its totient is φ = 6495422208.

The previous prime is 21110123407. The next prime is 21110123453. The reversal of 21110123424 is 42432101112.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 21110123424.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8456334 + ... + 8458829.

It is an arithmetic number, because the mean of its divisors is an integer number (1243264554).

Almost surely, 2^21110123424 is an apocalyptic number.

21110123424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21110123424 is an abundant number, since it is smaller than the sum of its proper divisors (38566575168).

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

21110123424 is a wasteful number, since it uses less digits than its factorization.

21110123424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16915189 (or 16915181 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21110123424 its reverse (42432101112), we get a palindrome (63542224536).

The spelling of 21110123424 in words is "twenty-one billion, one hundred ten million, one hundred twenty-three thousand, four hundred twenty-four".