212121201021100 has 72 divisors (see below), whose sum is σ = 531269099288928. Its totient is φ = 72007196928000.

The previous prime is 212121201021061. The next prime is 212121201021101. The reversal of 212121201021100 is 1120102121212.

It is not an unprimeable number, because it can be changed into a prime (212121201021101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1500079237 + ... + 1500220636.

It is an arithmetic number, because the mean of its divisors is an integer number (7378737490124).

Almost surely, 2^{212121201021100} is an apocalyptic number.

212121201021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212121201021100 is an abundant number, since it is smaller than the sum of its proper divisors (319147898267828).

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

212121201021100 is a wasteful number, since it uses less digits than its factorization.

212121201021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3000299995 (or 3000299988 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 212121201021100 its reverse (1120102121212), we get a palindrome (213241303142312).

The spelling of 212121201021100 in words is "two hundred twelve trillion, one hundred twenty-one billion, two hundred one million, twenty-one thousand, one hundred".