21111000120210 has 256 divisors, whose sum is σ = 68033425195008. Its totient is φ = 4048916889600.

The previous prime is 21111000120191. The next prime is 21111000120241. The reversal of 21111000120210 is 1202100011112.

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 127 ways as a sum of consecutive naturals, for example, 478566055 + ... + 478610165.

It is an arithmetic number, because the mean of its divisors is an integer number (265755567168).

Almost surely, 2^{21111000120210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21111000120210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34016712597504).

21111000120210 is an abundant number, since it is smaller than the sum of its proper divisors (46922425074798).

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

21111000120210 is a wasteful number, since it uses less digits than its factorization.

21111000120210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60089.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21111000120210 its reverse (1202100011112), we get a palindrome (22313100131322).

The spelling of 21111000120210 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty thousand, two hundred ten".