21002232224 has 24 divisors (see below), whose sum is σ = 41402813508. Its totient is φ = 10487232000.

The previous prime is 21002232131. The next prime is 21002232287. The reversal of 21002232224 is 42223220012.

It can be written as a sum of positive squares in 2 ways, for example, as 18818352400 + 2183879824 = 137180^2 + 46732^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21002232196 and 21002232205.

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, 409277 + ... + 457724.

Almost surely, 2^21002232224 is an apocalyptic number.

It is an amenable number.

21002232224 is a deficient number, since it is larger than the sum of its proper divisors (20400581284).

21002232224 is an equidigital number, since it uses as much as digits as its factorization.

21002232224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867768 (or 867760 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21002232224 its reverse (42223220012), we get a palindrome (63225452236).

The spelling of 21002232224 in words is "twenty-one billion, two million, two hundred thirty-two thousand, two hundred twenty-four".