212101112200021 has 32 divisors (see below), whose sum is σ = 242223299223552. Its totient is φ = 183961751400000.

The previous prime is 212101112200009. The next prime is 212101112200031. The reversal of 212101112200021 is 120002211101212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212101112200021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212101112199968 and 212101112200004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212101112200031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 501706951 + ... + 502129531.

It is an arithmetic number, because the mean of its divisors is an integer number (7569478100736).

Almost surely, 2^{212101112200021} is an apocalyptic number.

It is an amenable number.

212101112200021 is a deficient number, since it is larger than the sum of its proper divisors (30122187023531).

212101112200021 is a wasteful number, since it uses less digits than its factorization.

212101112200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443425.

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

Adding to 212101112200021 its reverse (120002211101212), we get a palindrome (332103323301233).

The spelling of 212101112200021 in words is "two hundred twelve trillion, one hundred one billion, one hundred twelve million, two hundred thousand, twenty-one".