21321140344 has 32 divisors (see below), whose sum is σ = 47263615200. Its totient is φ = 8822540160.

The previous prime is 21321140311. The next prime is 21321140363. The reversal of 21321140344 is 44304112312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6562767 + ... + 6566014.

It is an arithmetic number, because the mean of its divisors is an integer number (1476987975).

Almost surely, 2^21321140344 is an apocalyptic number.

It is an amenable number.

21321140344 is an abundant number, since it is smaller than the sum of its proper divisors (25942474856).

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

21321140344 is a wasteful number, since it uses less digits than its factorization.

21321140344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13128823 (or 13128819 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21321140344 its reverse (44304112312), we get a palindrome (65625252656).

The spelling of 21321140344 in words is "twenty-one billion, three hundred twenty-one million, one hundred forty thousand, three hundred forty-four".