211212000221 has 2 divisors, whose sum is σ = 211212000222. Its totient is φ = 211212000220.

The previous prime is 211212000211. The next prime is 211212000271. The reversal of 211212000221 is 122000212112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210869232025 + 342768196 = 459205^2 + 18514^2 .

It is a cyclic number.

It is not a de Polignac number, because 211212000221 - 2⁶ = 211212000157 is a prime.

It is a super-2 number, since 2×211212000221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211212000196 and 211212000205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211212000211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105606000110 + 105606000111.

It is an arithmetic number, because the mean of its divisors is an integer number (105606000111).

Almost surely, 2^211212000221 is an apocalyptic number.

It is an amenable number.

211212000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211212000221 is an equidigital number, since it uses as much as digits as its factorization.

211212000221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 211212000221 its reverse (122000212112), we get a palindrome (333212212333).

The spelling of 211212000221 in words is "two hundred eleven billion, two hundred twelve million, two hundred twenty-one", and thus it is an aban number.