211221010212 has 12 divisors (see below), whose sum is σ = 492849023856. Its totient is φ = 70407003400.

The previous prime is 211221010201. The next prime is 211221010213. The reversal of 211221010212 is 212010122112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×211221010212² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211221010191 and 211221010200.

It is not an unprimeable number, because it can be changed into a prime (211221010213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8800875414 + ... + 8800875437.

It is an arithmetic number, because the mean of its divisors is an integer number (41070751988).

Almost surely, 2^211221010212 is an apocalyptic number.

It is an amenable number.

211221010212 is an abundant number, since it is smaller than the sum of its proper divisors (281628013644).

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

211221010212 is a wasteful number, since it uses less digits than its factorization.

211221010212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17601750858 (or 17601750856 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 211221010212 its reverse (212010122112), we get a palindrome (423231132324).

The spelling of 211221010212 in words is "two hundred eleven billion, two hundred twenty-one million, ten thousand, two hundred twelve".