21323140224 has 64 divisors (see below), whose sum is σ = 56663480640. Its totient is φ = 7104715776.

The previous prime is 21323140187. The next prime is 21323140229. The reversal of 21323140224 is 42204132312.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

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 = 21323140194 and 21323140203.

It is not an unprimeable number, because it can be changed into a prime (21323140229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1017597 + ... + 1038339.

It is an arithmetic number, because the mean of its divisors is an integer number (885366885).

Almost surely, 2^21323140224 is an apocalyptic number.

21323140224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21323140224 is an abundant number, since it is smaller than the sum of its proper divisors (35340340416).

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

21323140224 is a wasteful number, since it uses less digits than its factorization.

21323140224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23437 (or 23425 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21323140224 its reverse (42204132312), we get a palindrome (63527272536).

The spelling of 21323140224 in words is "twenty-one billion, three hundred twenty-three million, one hundred forty thousand, two hundred twenty-four".