21242432222 has 16 divisors (see below), whose sum is σ = 34816521600. Its totient is φ = 9640046040.

The previous prime is 21242432143. The next prime is 21242432257. The reversal of 21242432222 is 22223424212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21242432191 and 21242432200.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 766322 + ... + 793557.

It is an arithmetic number, because the mean of its divisors is an integer number (2176032600).

Almost surely, 2^21242432222 is an apocalyptic number.

21242432222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21242432222 is a deficient number, since it is larger than the sum of its proper divisors (13574089378).

21242432222 is a wasteful number, since it uses less digits than its factorization.

21242432222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560511.

The product of its digits is 6144, while the sum is 26.

Adding to 21242432222 its reverse (22223424212), we get a palindrome (43465856434).

The spelling of 21242432222 in words is "twenty-one billion, two hundred forty-two million, four hundred thirty-two thousand, two hundred twenty-two".