21224154224 has 80 divisors (see below), whose sum is σ = 50639758848. Its totient is φ = 8391672576.

The previous prime is 21224154209. The next prime is 21224154233. The reversal of 21224154224 is 42245142212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3851279 + ... + 3856785.

Almost surely, 2^21224154224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21224154224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25319879424).

21224154224 is an abundant number, since it is smaller than the sum of its proper divisors (29415604624).

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

21224154224 is a wasteful number, since it uses less digits than its factorization.

21224154224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8182 (or 8176 counting only the distinct ones).

The product of its digits is 10240, while the sum is 29.

Adding to 21224154224 its reverse (42245142212), we get a palindrome (63469296436).

The spelling of 21224154224 in words is "twenty-one billion, two hundred twenty-four million, one hundred fifty-four thousand, two hundred twenty-four".