21102101224 has 32 divisors (see below), whose sum is σ = 41939224200. Its totient is φ = 9919651840.

The previous prime is 21102101201. The next prime is 21102101269. The reversal of 21102101224 is 42210120112.

It can be written as a sum of positive squares in 4 ways, for example, as 11972298724 + 9129802500 = 109418^2 + 95550^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21102101198 and 21102101207.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42834 + ... + 209854.

Almost surely, 2^21102101224 is an apocalyptic number.

It is an amenable number.

21102101224 is a deficient number, since it is larger than the sum of its proper divisors (20837122976).

21102101224 is a wasteful number, since it uses less digits than its factorization.

21102101224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167973 (or 167969 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21102101224 its reverse (42210120112), we get a palindrome (63312221336).

The spelling of 21102101224 in words is "twenty-one billion, one hundred two million, one hundred one thousand, two hundred twenty-four".