2121112012100 has 18 divisors (see below), whose sum is σ = 4602813066474. Its totient is φ = 848444804800.

The previous prime is 2121112012043. The next prime is 2121112012169. The reversal of 2121112012100 is 12102111212.

It can be written as a sum of positive squares in 3 ways, for example, as 238266991876 + 1882845020224 = 488126^2 + 1372168^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 10605559961 + ... + 10605560160.

Almost surely, 2^{2121112012100} is an apocalyptic number.

2121112012100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121112012100 is an abundant number, since it is smaller than the sum of its proper divisors (2481701054374).

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

2121112012100 is a wasteful number, since it uses less digits than its factorization.

2121112012100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21211120135 (or 21211120128 counting only the distinct ones).

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

Adding to 2121112012100 its reverse (12102111212), we get a palindrome (2133214123312).

The spelling of 2121112012100 in words is "two trillion, one hundred twenty-one billion, one hundred twelve million, twelve thousand, one hundred".