21420212223 has 8 divisors (see below), whose sum is σ = 28617520000. Its totient is φ = 14251522968.

The previous prime is 21420212221. The next prime is 21420212237. The reversal of 21420212223 is 32221202412.

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

It is not a de Polignac number, because 21420212223 - 2¹ = 21420212221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21420212223.

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 7 ways as a sum of consecutive naturals, for example, 7152883 + ... + 7155876.

It is an arithmetic number, because the mean of its divisors is an integer number (3577190000).

Almost surely, 2^21420212223 is an apocalyptic number.

21420212223 is a deficient number, since it is larger than the sum of its proper divisors (7197307777).

21420212223 is a wasteful number, since it uses less digits than its factorization.

21420212223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14309261.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21420212223 its reverse (32221202412), we get a palindrome (53641414635).

The spelling of 21420212223 in words is "twenty-one billion, four hundred twenty million, two hundred twelve thousand, two hundred twenty-three".