212112100012221 has 24 divisors (see below), whose sum is σ = 316950872715360. Its totient is φ = 136531169258400.

The previous prime is 212112100012213. The next prime is 212112100012223. The reversal of 212112100012221 is 122210001211212.

212112100012221 is a `hidden beast` number, since 21 + 211 + 210 + 0 + 0 + 1 + 2 + 221 = 666.

It is not a de Polignac number, because 212112100012221 - 2³ = 212112100012213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212112100012194 and 212112100012203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212112100012223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46953186 + ... + 51272076.

It is an arithmetic number, because the mean of its divisors is an integer number (13206286363140).

Almost surely, 2^{212112100012221} is an apocalyptic number.

It is an amenable number.

212112100012221 is a deficient number, since it is larger than the sum of its proper divisors (104838772703139).

212112100012221 is a wasteful number, since it uses less digits than its factorization.

212112100012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4507097 (or 4507094 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 212112100012221 its reverse (122210001211212), we get a palindrome (334322101223433).

The spelling of 212112100012221 in words is "two hundred twelve trillion, one hundred twelve billion, one hundred million, twelve thousand, two hundred twenty-one".