221211012012 has 24 divisors (see below), whose sum is σ = 516519262896. Its totient is φ = 73685541888.

The previous prime is 221211011971. The next prime is 221211012031. The reversal of 221211012012 is 210210112122.

It is a junction number, because it is equal to n+sod(n) for n = 221211011982 and 221211012000.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6414853 + ... + 6449244.

It is an arithmetic number, because the mean of its divisors is an integer number (21521635954).

Almost surely, 2^221211012012 is an apocalyptic number.

It is an amenable number.

221211012012 is an abundant number, since it is smaller than the sum of its proper divisors (295308250884).

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

221211012012 is a wasteful number, since it uses less digits than its factorization.

221211012012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12865537 (or 12865535 counting only the distinct ones).

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

Adding to 221211012012 its reverse (210210112122), we get a palindrome (431421124134).

The spelling of 221211012012 in words is "two hundred twenty-one billion, two hundred eleven million, twelve thousand, twelve".