21102012224 has 28 divisors (see below), whose sum is σ = 41896437924. Its totient is φ = 10545429504.

The previous prime is 21102012203. The next prime is 21102012227. The reversal of 21102012224 is 42221020112.

It can be written as a sum of positive squares in 2 ways, for example, as 19721146624 + 1380865600 = 140432^2 + 37160^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102012227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36254 + ... + 208610.

Almost surely, 2^21102012224 is an apocalyptic number.

It is an amenable number.

21102012224 is a deficient number, since it is larger than the sum of its proper divisors (20794425700).

21102012224 is a wasteful number, since it uses less digits than its factorization.

21102012224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174282 (or 174272 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21102012224 its reverse (42221020112), we get a palindrome (63323032336).

The spelling of 21102012224 in words is "twenty-one billion, one hundred two million, twelve thousand, two hundred twenty-four".