21440514255220 has 24 divisors (see below), whose sum is σ = 45025828130304. Its totient is φ = 8576063188896.

The previous prime is 21440514255211. The next prime is 21440514255221. The reversal of 21440514255220 is 2255241504412.

It is a super-3 number, since 3×21440514255220³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21440514255220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440514255221) 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, 7669224 + ... + 10084543.

It is an arithmetic number, because the mean of its divisors is an integer number (1876076172096).

Almost surely, 2^{21440514255220} is an apocalyptic number.

21440514255220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21440514255220 is an abundant number, since it is smaller than the sum of its proper divisors (23585313875084).

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

21440514255220 is a wasteful number, since it uses less digits than its factorization.

21440514255220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17814159 (or 17814157 counting only the distinct ones).

The product of its (nonzero) digits is 128000, while the sum is 37.

Adding to 21440514255220 its reverse (2255241504412), we get a palindrome (23695755759632).

The spelling of 21440514255220 in words is "twenty-one trillion, four hundred forty billion, five hundred fourteen million, two hundred fifty-five thousand, two hundred twenty".