21102210204 has 12 divisors (see below), whose sum is σ = 49238490504. Its totient is φ = 7034070064.

The previous prime is 21102210197. The next prime is 21102210221. The reversal of 21102210204 is 40201220112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879258747 + ... + 879258770.

It is an arithmetic number, because the mean of its divisors is an integer number (4103207542).

Almost surely, 2^21102210204 is an apocalyptic number.

It is an amenable number.

21102210204 is an abundant number, since it is smaller than the sum of its proper divisors (28136280300).

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

21102210204 is a wasteful number, since it uses less digits than its factorization.

21102210204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758517524 (or 1758517522 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21102210204 its reverse (40201220112), we get a palindrome (61303430316).

The spelling of 21102210204 in words is "twenty-one billion, one hundred two million, two hundred ten thousand, two hundred four".