212112202200021 has 12 divisors (see below), whose sum is σ = 306385187286048. Its totient is φ = 141407721621864.

The previous prime is 212112202200007. The next prime is 212112202200089. The reversal of 212112202200021 is 120002202211212.

It is a happy number.

212112202200021 is a `hidden beast` number, since 212 + 11 + 220 + 2 + 200 + 0 + 21 = 666.

It is not a de Polignac number, because 212112202200021 - 2⁶ = 212112202199957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212112202199967 and 212112202200003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212112202205021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31163865 + ... + 37355198.

It is an arithmetic number, because the mean of its divisors is an integer number (25532098940504).

Almost surely, 2^{212112202200021} is an apocalyptic number.

It is an amenable number.

212112202200021 is a deficient number, since it is larger than the sum of its proper divisors (94272985086027).

212112202200021 is a wasteful number, since it uses less digits than its factorization.

212112202200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68863032 (or 68863029 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 212112202200021 its reverse (120002202211212), we get a palindrome (332114404411233).

The spelling of 212112202200021 in words is "two hundred twelve trillion, one hundred twelve billion, two hundred two million, two hundred thousand, twenty-one".