21423334220 has 48 divisors (see below), whose sum is σ = 45480760416. Its totient is φ = 8475840000.

The previous prime is 21423334213. The next prime is 21423334243. The reversal of 21423334220 is 2243332412.

It is a self number, because there is not a number n which added to its sum of digits gives 21423334220.

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, 2198960 + ... + 2208680.

It is an arithmetic number, because the mean of its divisors is an integer number (947515842).

Almost surely, 2^21423334220 is an apocalyptic number.

21423334220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21423334220 is an abundant number, since it is smaller than the sum of its proper divisors (24057426196).

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

21423334220 is a wasteful number, since it uses less digits than its factorization.

21423334220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10922 (or 10920 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 21423334220 its reverse (2243332412), we get a palindrome (23666666632).

The spelling of 21423334220 in words is "twenty-one billion, four hundred twenty-three million, three hundred thirty-four thousand, two hundred twenty".