2100121111000 has 256 divisors, whose sum is σ = 5396751360000. Its totient is φ = 758612160000.

The previous prime is 2100121110979. The next prime is 2100121111037. The reversal of 2100121111000 is 1111210012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1193928121 + ... + 1193929879.

It is an arithmetic number, because the mean of its divisors is an integer number (21081060000).

Almost surely, 2^{2100121111000} is an apocalyptic number.

2100121111000 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 2100121111000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2698375680000).

2100121111000 is an abundant number, since it is smaller than the sum of its proper divisors (3296630249000).

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

2100121111000 is a wasteful number, since it uses less digits than its factorization.

2100121111000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451 (or 2437 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 2100121111000 its reverse (1111210012), we get a palindrome (2101232321012).

The spelling of 2100121111000 in words is "two trillion, one hundred billion, one hundred twenty-one million, one hundred eleven thousand".