21222420424 has 64 divisors (see below), whose sum is σ = 44958196800. Its totient is φ = 9331697664.

The previous prime is 21222420421. The next prime is 21222420449. The reversal of 21222420424 is 42402422212.

It is a super-2 number, since 2×21222420424² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21222420421) by changing a digit.

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, 132379 + ... + 244885.

It is an arithmetic number, because the mean of its divisors is an integer number (702471825).

Almost surely, 2^21222420424 is an apocalyptic number.

It is an amenable number.

21222420424 is an abundant number, since it is smaller than the sum of its proper divisors (23735776376).

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

21222420424 is a wasteful number, since it uses less digits than its factorization.

21222420424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112622 (or 112618 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 25.

Adding to 21222420424 its reverse (42402422212), we get a palindrome (63624842636).

The spelling of 21222420424 in words is "twenty-one billion, two hundred twenty-two million, four hundred twenty thousand, four hundred twenty-four".