21242422224 has 30 divisors (see below), whose sum is σ = 59449279266. Its totient is φ = 7080807360.

The previous prime is 21242422177. The next prime is 21242422247. The reversal of 21242422224 is 42222424212.

21242422224 is a `hidden beast` number, since 2 + 12 + 4 + 2 + 422 + 224 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11250420624 + 9992001600 = 106068^2 + 99960^2 .

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73758267 + ... + 73758554.

Almost surely, 2^21242422224 is an apocalyptic number.

21242422224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21242422224 is an abundant number, since it is smaller than the sum of its proper divisors (38206857042).

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

21242422224 is a wasteful number, since it uses less digits than its factorization.

21242422224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147516835 (or 147516826 counting only the distinct ones).

The product of its digits is 8192, while the sum is 27.

Adding to 21242422224 its reverse (42222424212), we get a palindrome (63464846436).

The spelling of 21242422224 in words is "twenty-one billion, two hundred forty-two million, four hundred twenty-two thousand, two hundred twenty-four".