21102102210 has 64 divisors (see below), whose sum is σ = 61284771072. Its totient is φ = 4539611136.

The previous prime is 21102102199. The next prime is 21102102223. The reversal of 21102102210 is 1220120112.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2951907 + ... + 2959046.

It is an arithmetic number, because the mean of its divisors is an integer number (957574548).

Almost surely, 2^21102102210 is an apocalyptic number.

21102102210 is an abundant number, since it is smaller than the sum of its proper divisors (40182668862).

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

21102102210 is a wasteful number, since it uses less digits than its factorization.

21102102210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5910987.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21102102210 its reverse (1220120112), we get a palindrome (22322222322).

The spelling of 21102102210 in words is "twenty-one billion, one hundred two million, one hundred two thousand, two hundred ten".