21420224122224 has 20 divisors (see below), whose sum is σ = 55335578982536. Its totient is φ = 7140074707392.

The previous prime is 21420224122217. The next prime is 21420224122289. The reversal of 21420224122224 is 42222142202412.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21420224122191 and 21420224122200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223127334559 + ... + 223127334654.

Almost surely, 2^{21420224122224} is an apocalyptic number.

21420224122224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21420224122224 is an abundant number, since it is smaller than the sum of its proper divisors (33915354860312).

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

21420224122224 is a wasteful number, since it uses less digits than its factorization.

21420224122224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446254669224 (or 446254669218 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 30.

Adding to 21420224122224 its reverse (42222142202412), we get a palindrome (63642366324636).

The spelling of 21420224122224 in words is "twenty-one trillion, four hundred twenty billion, two hundred twenty-four million, one hundred twenty-two thousand, two hundred twenty-four".