21222324420 has 96 divisors (see below), whose sum is σ = 64849196160. Its totient is φ = 5142850560.

The previous prime is 21222324413. The next prime is 21222324421. The reversal of 21222324420 is 2442322212.

It is not an unprimeable number, because it can be changed into a prime (21222324421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2525586 + ... + 2533974.

It is an arithmetic number, because the mean of its divisors is an integer number (675512460).

Almost surely, 2^21222324420 is an apocalyptic number.

21222324420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222324420 is an abundant number, since it is smaller than the sum of its proper divisors (43626871740).

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

21222324420 is a wasteful number, since it uses less digits than its factorization.

21222324420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12245 (or 12243 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21222324420 its reverse (2442322212), we get a palindrome (23664646632).

The spelling of 21222324420 in words is "twenty-one billion, two hundred twenty-two million, three hundred twenty-four thousand, four hundred twenty".