21102011012102 has 4 divisors (see below), whose sum is σ = 31653016518156. Its totient is φ = 10551005506050.

The previous prime is 21102011012099. The next prime is 21102011012107. The reversal of 21102011012102 is 20121011020112.

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 (21102011012107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275502753024 + ... + 5275502753027.

It is an arithmetic number, because the mean of its divisors is an integer number (7913254129539).

Almost surely, 2^{21102011012102} is an apocalyptic number.

21102011012102 is a deficient number, since it is larger than the sum of its proper divisors (10551005506054).

21102011012102 is a wasteful number, since it uses less digits than its factorization.

21102011012102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10551005506053.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21102011012102 its reverse (20121011020112), we get a palindrome (41223022032214).

The spelling of 21102011012102 in words is "twenty-one trillion, one hundred two billion, eleven million, twelve thousand, one hundred two".