21210010102 has 8 divisors (see below), whose sum is σ = 31823262576. Its totient is φ = 10602255912.

The previous prime is 21210010097. The next prime is 21210010177. The reversal of 21210010102 is 20101001212.

21210010102 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 1364913 + ... + 1380364.

It is an arithmetic number, because the mean of its divisors is an integer number (3977907822).

Almost surely, 2^21210010102 is an apocalyptic number.

21210010102 is a deficient number, since it is larger than the sum of its proper divisors (10613252474).

21210010102 is a wasteful number, since it uses less digits than its factorization.

21210010102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2749142.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21210010102 its reverse (20101001212), we get a palindrome (41311011314).

The spelling of 21210010102 in words is "twenty-one billion, two hundred ten million, ten thousand, one hundred two".