21344323180 has 24 divisors (see below), whose sum is σ = 44840290320. Its totient is φ = 8534450880.

The previous prime is 21344323177. The next prime is 21344323181. The reversal of 21344323180 is 8132344312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21344323181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151170 + ... + 256009.

It is an arithmetic number, because the mean of its divisors is an integer number (1868345430).

Almost surely, 2^21344323180 is an apocalyptic number.

21344323180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21344323180 is an abundant number, since it is smaller than the sum of its proper divisors (23495967140).

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

21344323180 is a wasteful number, since it uses less digits than its factorization.

21344323180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409809 (or 409807 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 21344323180 its reverse (8132344312), we get a palindrome (29476667492).

The spelling of 21344323180 in words is "twenty-one billion, three hundred forty-four million, three hundred twenty-three thousand, one hundred eighty".