21211221112102 has 16 divisors (see below), whose sum is σ = 37943053915392. Its totient is φ = 8695283188680.

The previous prime is 21211221112073. The next prime is 21211221112129. The reversal of 21211221112102 is 20121112211212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21211221112102.

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, 32936678424 + ... + 32936679067.

It is an arithmetic number, because the mean of its divisors is an integer number (2371440869712).

Almost surely, 2^{21211221112102} is an apocalyptic number.

21211221112102 is a deficient number, since it is larger than the sum of its proper divisors (16731832803290).

21211221112102 is a wasteful number, since it uses less digits than its factorization.

21211221112102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65873357523.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21211221112102 its reverse (20121112211212), we get a palindrome (41332333323314).

The spelling of 21211221112102 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-one million, one hundred twelve thousand, one hundred two".