210121111220000 has 120 divisors (see below), whose sum is σ = 516942777859200. Its totient is φ = 84046277792000.

The previous prime is 210121111219993. The next prime is 210121111220057. The reversal of 210121111220000 is 22111121012.

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 19 ways as a sum of consecutive naturals, for example, 938268041 + ... + 938491959.

It is an arithmetic number, because the mean of its divisors is an integer number (4307856482160).

Almost surely, 2^{210121111220000} is an apocalyptic number.

210121111220000 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 210121111220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258471388929600).

210121111220000 is an abundant number, since it is smaller than the sum of its proper divisors (306821666639200).

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

210121111220000 is an equidigital number, since it uses as much as digits as its factorization.

210121111220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270868 (or 270845 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 210121111220000 its reverse (22111121012), we get a palindrome (210143222341012).

The spelling of 210121111220000 in words is "two hundred ten trillion, one hundred twenty-one billion, one hundred eleven million, two hundred twenty thousand".