2221110121212 has 144 divisors (see below), whose sum is σ = 5899860281952. Its totient is φ = 703848683520.

The previous prime is 2221110121193. The next prime is 2221110121247. The reversal of 2221110121212 is 2121210111222.

2221110121212 is a `hidden beast` number, since 2 + 221 + 110 + 121 + 212 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10297512 + ... + 10510992.

It is an arithmetic number, because the mean of its divisors is an integer number (40971251958).

Almost surely, 2^{2221110121212} 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 2221110121212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2949930140976).

2221110121212 is an abundant number, since it is smaller than the sum of its proper divisors (3678750160740).

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

2221110121212 is a wasteful number, since it uses less digits than its factorization.

2221110121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213708 (or 213703 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 2221110121212 its reverse (2121210111222), we get a palindrome (4342320232434).

The spelling of 2221110121212 in words is "two trillion, two hundred twenty-one billion, one hundred ten million, one hundred twenty-one thousand, two hundred twelve".