221211111012 has 48 divisors (see below), whose sum is σ = 531334242432. Its totient is φ = 71578391040.

The previous prime is 221211110971. The next prime is 221211111031. The reversal of 221211111012 is 210111112122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221211110982 and 221211111000.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 383064 + ... + 767567.

It is an arithmetic number, because the mean of its divisors is an integer number (11069463384).

Almost surely, 2^221211111012 is an apocalyptic number.

It is an amenable number.

221211111012 is an abundant number, since it is smaller than the sum of its proper divisors (310123131420).

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

221211111012 is a wasteful number, since it uses less digits than its factorization.

221211111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151108 (or 1151106 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221211111012 its reverse (210111112122), we get a palindrome (431322223134).

The spelling of 221211111012 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, twelve".