21440322120 has 64 divisors (see below), whose sum is σ = 73509678720. Its totient is φ = 4900644864.

The previous prime is 21440322119. The next prime is 21440322143. The reversal of 21440322120 is 2122304412.

It is a super-2 number, since 2×21440322120² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 15 ways as a sum of consecutive naturals, for example, 12761257 + ... + 12762936.

It is an arithmetic number, because the mean of its divisors is an integer number (1148588730).

Almost surely, 2^21440322120 is an apocalyptic number.

21440322120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21440322120 is an abundant number, since it is smaller than the sum of its proper divisors (52069356600).

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

21440322120 is a wasteful number, since it uses less digits than its factorization.

21440322120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25524214 (or 25524210 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21440322120 its reverse (2122304412), we get a palindrome (23562626532).

The spelling of 21440322120 in words is "twenty-one billion, four hundred forty million, three hundred twenty-two thousand, one hundred twenty".