211221212211012 has 24 divisors (see below), whose sum is σ = 492849730439136. Its totient is φ = 70407037125568.

The previous prime is 211221212211007. The next prime is 211221212211059. The reversal of 211221212211012 is 210112212122112.

It is a super-2 number, since 2×211221212211012² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211221212211012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45514483 + ... + 49940069.

It is an arithmetic number, because the mean of its divisors is an integer number (20535405434964).

Almost surely, 2^{211221212211012} is an apocalyptic number.

It is an amenable number.

211221212211012 is an abundant number, since it is smaller than the sum of its proper divisors (281628518228124).

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

211221212211012 is a wasteful number, since it uses less digits than its factorization.

211221212211012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8402867 (or 8402865 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 211221212211012 its reverse (210112212122112), we get a palindrome (421333424333124).

The spelling of 211221212211012 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twelve million, two hundred eleven thousand, twelve".