21200102102 has 16 divisors (see below), whose sum is σ = 32116780800. Its totient is φ = 10494559272.

The previous prime is 21200102081. The next prime is 21200102159. The reversal of 21200102102 is 20120100212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1040303 + ... + 1060485.

It is an arithmetic number, because the mean of its divisors is an integer number (2007298800).

Almost surely, 2^21200102102 is an apocalyptic number.

21200102102 is a deficient number, since it is larger than the sum of its proper divisors (10916678698).

21200102102 is a wasteful number, since it uses less digits than its factorization.

21200102102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25387.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21200102102 its reverse (20120100212), we get a palindrome (41320202314).

The spelling of 21200102102 in words is "twenty-one billion, two hundred million, one hundred two thousand, one hundred two".