21211100120102 has 4 divisors (see below), whose sum is σ = 31816650180156. Its totient is φ = 10605550060050.

The previous prime is 21211100120087. The next prime is 21211100120113. The reversal of 21211100120102 is 20102100111212.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5302775030024 + ... + 5302775030027.

It is an arithmetic number, because the mean of its divisors is an integer number (7954162545039).

Almost surely, 2^{21211100120102} is an apocalyptic number.

21211100120102 is a deficient number, since it is larger than the sum of its proper divisors (10605550060054).

21211100120102 is a wasteful number, since it uses less digits than its factorization.

21211100120102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10605550060053.

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

Adding to 21211100120102 its reverse (20102100111212), we get a palindrome (41313200231314).

The spelling of 21211100120102 in words is "twenty-one trillion, two hundred eleven billion, one hundred million, one hundred twenty thousand, one hundred two".