21421202223 has 12 divisors (see below), whose sum is σ = 30340527560. Its totient is φ = 13440753792.

The previous prime is 21421202203. The next prime is 21421202287. The reversal of 21421202223 is 32220212412.

It is not a de Polignac number, because 21421202223 - 2¹³ = 21421194031 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 21421202223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421202203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12352768 + ... + 12354501.

Almost surely, 2^21421202223 is an apocalyptic number.

21421202223 is a deficient number, since it is larger than the sum of its proper divisors (8919325337).

21421202223 is a wasteful number, since it uses less digits than its factorization.

21421202223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24707306 (or 24707289 counting only the distinct ones).

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

Adding to 21421202223 its reverse (32220212412), we get a palindrome (53641414635).

The spelling of 21421202223 in words is "twenty-one billion, four hundred twenty-one million, two hundred two thousand, two hundred twenty-three".