21211100122110 has 32 divisors (see below), whose sum is σ = 52662041684640. Its totient is φ = 5461248766848.

The previous prime is 21211100121917. The next prime is 21211100122111. The reversal of 21211100122110 is 1122100111212.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21211100122110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211100122111) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 12190286557 + ... + 12190288296.

It is an arithmetic number, because the mean of its divisors is an integer number (1645688802645).

Almost surely, 2^{21211100122110} is an apocalyptic number.

21211100122110 is an abundant number, since it is smaller than the sum of its proper divisors (31450941562530).

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

21211100122110 is a wasteful number, since it uses less digits than its factorization.

21211100122110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24380574892.

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

Adding to 21211100122110 its reverse (1122100111212), we get a palindrome (22333200233322).

The spelling of 21211100122110 in words is "twenty-one trillion, two hundred eleven billion, one hundred million, one hundred twenty-two thousand, one hundred ten".