21440545314320 has 80 divisors (see below), whose sum is σ = 54741159020160. Its totient is φ = 7744929024000.

The previous prime is 21440545314319. The next prime is 21440545314337. The reversal of 21440545314320 is 2341354504412.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80543465 + ... + 80809224.

It is an arithmetic number, because the mean of its divisors is an integer number (684264487752).

Almost surely, 2^{21440545314320} is an apocalyptic number.

21440545314320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21440545314320 is an abundant number, since it is smaller than the sum of its proper divisors (33300613705840).

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

21440545314320 is a wasteful number, since it uses less digits than its factorization.

21440545314320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161352864 (or 161352858 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 38.

Adding to 21440545314320 its reverse (2341354504412), we get a palindrome (23781899818732).

The spelling of 21440545314320 in words is "twenty-one trillion, four hundred forty billion, five hundred forty-five million, three hundred fourteen thousand, three hundred twenty".