21111320120210 has 16 divisors (see below), whose sum is σ = 40000396017600. Its totient is φ = 8000079203376.

The previous prime is 21111320120203. The next prime is 21111320120227. The reversal of 21111320120210 is 1202102311112.

It is a happy number.

It is a Curzon 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, 55556105390 + ... + 55556105769.

It is an arithmetic number, because the mean of its divisors is an integer number (2500024751100).

Almost surely, 2^{21111320120210} is an apocalyptic number.

21111320120210 is a deficient number, since it is larger than the sum of its proper divisors (18889075897390).

21111320120210 is a wasteful number, since it uses less digits than its factorization.

21111320120210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111112211185.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21111320120210 its reverse (1202102311112), we get a palindrome (22313422431322).

The spelling of 21111320120210 in words is "twenty-one trillion, one hundred eleven billion, three hundred twenty million, one hundred twenty thousand, two hundred ten".