212120200121100 has 144 divisors (see below), whose sum is σ = 621908228325888. Its totient is φ = 55813753007360.

The previous prime is 212120200121051. The next prime is 212120200121117. The reversal of 212120200121100 is 1121002021212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 212120200121100.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14500957 + ... + 25189643.

It is an arithmetic number, because the mean of its divisors is an integer number (4318807141152).

Almost surely, 2^{212120200121100} is an apocalyptic number.

212120200121100 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 212120200121100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (310954114162944).

212120200121100 is an abundant number, since it is smaller than the sum of its proper divisors (409788028204788).

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

212120200121100 is a wasteful number, since it uses less digits than its factorization.

212120200121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10689584 (or 10689577 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 212120200121100 its reverse (1121002021212), we get a palindrome (213241202142312).

The spelling of 212120200121100 in words is "two hundred twelve trillion, one hundred twenty billion, two hundred million, one hundred twenty-one thousand, one hundred".