21342240024 has 64 divisors (see below), whose sum is σ = 60990263040. Its totient is φ = 6096539520.

The previous prime is 21342240013. The next prime is 21342240047. The reversal of 21342240024 is 42004224312.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 21342239976 and 21342240003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1094262 + ... + 1113594.

It is an arithmetic number, because the mean of its divisors is an integer number (952972860).

Almost surely, 2^21342240024 is an apocalyptic number.

21342240024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21342240024 is an abundant number, since it is smaller than the sum of its proper divisors (39648023016).

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

21342240024 is a wasteful number, since it uses less digits than its factorization.

21342240024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25920 (or 25916 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21342240024 its reverse (42004224312), we get a palindrome (63346464336).

The spelling of 21342240024 in words is "twenty-one billion, three hundred forty-two million, two hundred forty thousand, twenty-four".