211213102221212 has 144 divisors (see below), whose sum is σ = 477369820730880. Its totient is φ = 79913561105664.

The previous prime is 211213102221211. The next prime is 211213102221241. The reversal of 211213102221212 is 212122201312112.

It is a super-2 number, since 2×211213102221212² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211213102221211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 866539214 + ... + 866782922.

It is an arithmetic number, because the mean of its divisors is an integer number (3315068199520).

Almost surely, 2^{211213102221212} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211213102221212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238684910365440).

211213102221212 is an abundant number, since it is smaller than the sum of its proper divisors (266156718509668).

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

211213102221212 is a wasteful number, since it uses less digits than its factorization.

211213102221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251732 (or 251717 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 211213102221212 its reverse (212122201312112), we get a palindrome (423335303533324).

The spelling of 211213102221212 in words is "two hundred eleven trillion, two hundred thirteen billion, one hundred two million, two hundred twenty-one thousand, two hundred twelve".