21102002110102 has 4 divisors (see below), whose sum is σ = 31653003165156. Its totient is φ = 10551001055050.

The previous prime is 21102002110051. The next prime is 21102002110103. The reversal of 21102002110102 is 20101120020112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102002110103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275500527524 + ... + 5275500527527.

It is an arithmetic number, because the mean of its divisors is an integer number (7913250791289).

Almost surely, 2^{21102002110102} is an apocalyptic number.

21102002110102 is a deficient number, since it is larger than the sum of its proper divisors (10551001055054).

21102002110102 is a wasteful number, since it uses less digits than its factorization.

21102002110102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10551001055053.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21102002110102 its reverse (20101120020112), we get a palindrome (41203122130214).

The spelling of 21102002110102 in words is "twenty-one trillion, one hundred two billion, two million, one hundred ten thousand, one hundred two".