21420310224 has 20 divisors (see below), whose sum is σ = 55335801536. Its totient is φ = 7140103392.

The previous prime is 21420310187. The next prime is 21420310237. The reversal of 21420310224 is 42201302412.

It is a self number, because there is not a number n which added to its sum of digits gives 21420310224.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223128184 + ... + 223128279.

Almost surely, 2^21420310224 is an apocalyptic number.

21420310224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21420310224 is an abundant number, since it is smaller than the sum of its proper divisors (33915491312).

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

21420310224 is a wasteful number, since it uses less digits than its factorization.

21420310224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446256474 (or 446256468 counting only the distinct ones).

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

Adding to 21420310224 its reverse (42201302412), we get a palindrome (63621612636).

The spelling of 21420310224 in words is "twenty-one billion, four hundred twenty million, three hundred ten thousand, two hundred twenty-four".