21440520500220 has 192 divisors, whose sum is σ = 71262551001600. Its totient is φ = 5335708308480.

The previous prime is 21440520500197. The next prime is 21440520500263. The reversal of 21440520500220 is 2200502504412.

21440520500220 is a `hidden beast` number, since 2 + 14 + 405 + 20 + 5 + 0 + 0 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14907501 + ... + 16282340.

It is an arithmetic number, because the mean of its divisors is an integer number (371159119800).

Almost surely, 2^{21440520500220} is an apocalyptic number.

21440520500220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21440520500220 is an abundant number, since it is smaller than the sum of its proper divisors (49822030501380).

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

21440520500220 is a wasteful number, since it uses less digits than its factorization.

21440520500220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31189945 (or 31189937 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The spelling of 21440520500220 in words is "twenty-one trillion, four hundred forty billion, five hundred twenty million, five hundred thousand, two hundred twenty".