21210122101110 has 16 divisors (see below), whose sum is σ = 50904293042736. Its totient is φ = 5656032560288.

The previous prime is 21210122101109. The next prime is 21210122101177. The reversal of 21210122101110 is 1110122101212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21210122101110.

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, 353502034989 + ... + 353502035048.

It is an arithmetic number, because the mean of its divisors is an integer number (3181518315171).

Almost surely, 2^{21210122101110} is an apocalyptic number.

21210122101110 is an abundant number, since it is smaller than the sum of its proper divisors (29694170941626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21210122101110 is a wasteful number, since it uses less digits than its factorization.

21210122101110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707004070047.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21210122101110 its reverse (1110122101212), we get a palindrome (22320244202322).

The spelling of 21210122101110 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-two million, one hundred one thousand, one hundred ten".