210111221010100 has 144 divisors (see below), whose sum is σ = 476219999219328. Its totient is φ = 80313516264960.

The previous prime is 210111221010071. The next prime is 210111221010107. The reversal of 210111221010100 is 1010122111012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210111221010107) 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 47 ways as a sum of consecutive naturals, for example, 13354801834 + ... + 13354817566.

It is an arithmetic number, because the mean of its divisors is an integer number (3307083327912).

Almost surely, 2^{210111221010100} is an apocalyptic number.

210111221010100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 210111221010100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238109999609664).

210111221010100 is an abundant number, since it is smaller than the sum of its proper divisors (266108778209228).

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

210111221010100 is a wasteful number, since it uses less digits than its factorization.

210111221010100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20954 (or 20947 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 210111221010100 its reverse (1010122111012), we get a palindrome (211121343121112).

The spelling of 210111221010100 in words is "two hundred ten trillion, one hundred eleven billion, two hundred twenty-one million, ten thousand, one hundred".