21420212222 has 8 divisors (see below), whose sum is σ = 32246313096. Its totient is φ = 10671441192.

The previous prime is 21420212221. The next prime is 21420212237. The reversal of 21420212222 is 22221202412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21420212194 and 21420212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420212221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19331768 + ... + 19332875.

It is an arithmetic number, because the mean of its divisors is an integer number (4030789137).

Almost surely, 2^21420212222 is an apocalyptic number.

21420212222 is a deficient number, since it is larger than the sum of its proper divisors (10826100874).

21420212222 is a wasteful number, since it uses less digits than its factorization.

21420212222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38664922.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21420212222 its reverse (22221202412), we get a palindrome (43641414634).

The spelling of 21420212222 in words is "twenty-one billion, four hundred twenty million, two hundred twelve thousand, two hundred twenty-two".