21102125204 has 12 divisors (see below), whose sum is σ = 36983271444. Its totient is φ = 10535476224.

The previous prime is 21102125197. The next prime is 21102125267. The reversal of 21102125204 is 40252120112.

It can be written as a sum of positive squares in 2 ways, for example, as 16217513104 + 4884612100 = 127348^2 + 69890^2 .

It is a congruent number.

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, 3893549 + ... + 3898964.

It is an arithmetic number, because the mean of its divisors is an integer number (3081939287).

Almost surely, 2^21102125204 is an apocalyptic number.

It is an amenable number.

21102125204 is a deficient number, since it is larger than the sum of its proper divisors (15881146240).

21102125204 is a wasteful number, since it uses less digits than its factorization.

21102125204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7793194 (or 7793192 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 21102125204 its reverse (40252120112), we get a palindrome (61354245316).

The spelling of 21102125204 in words is "twenty-one billion, one hundred two million, one hundred twenty-five thousand, two hundred four".