2100121121100 has 288 divisors, whose sum is σ = 6350592383296. Its totient is φ = 535312281600.

The previous prime is 2100121121099. The next prime is 2100121121107. The reversal of 2100121121100 is 11211210012.

It is a super-3 number, since 3×2100121121100³ (a number of 38 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (2100121121107) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 821321022 + ... + 821323578.

Almost surely, 2^{2100121121100} is an apocalyptic number.

2100121121100 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 2100121121100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3175296191648).

2100121121100 is an abundant number, since it is smaller than the sum of its proper divisors (4250471262196).

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

2100121121100 is a wasteful number, since it uses less digits than its factorization.

2100121121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3885 (or 3878 counting only the distinct ones).

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

Adding to 2100121121100 its reverse (11211210012), we get a palindrome (2111332331112).

The spelling of 2100121121100 in words is "two trillion, one hundred billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred".