2221020211212 has 144 divisors (see below), whose sum is σ = 6302541117600. Its totient is φ = 653557524480.

The previous prime is 2221020211211. The next prime is 2221020211237. The reversal of 2221020211212 is 2121120201222.

It is a happy number.

2221020211212 is a `hidden beast` number, since 2 + 221 + 0 + 20 + 211 + 212 = 666.

It is a super-2 number, since 2×2221020211212² (a number of 25 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (2221020211211) 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, 7308964 + ... + 7606772.

It is an arithmetic number, because the mean of its divisors is an integer number (43767646650).

Almost surely, 2^{2221020211212} is an apocalyptic number.

2221020211212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2221020211212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3151270558800).

2221020211212 is an abundant number, since it is smaller than the sum of its proper divisors (4081520906388).

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

2221020211212 is a wasteful number, since it uses less digits than its factorization.

2221020211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298376 (or 298371 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2221020211212 its reverse (2121120201222), we get a palindrome (4342140412434).

The spelling of 2221020211212 in words is "two trillion, two hundred twenty-one billion, twenty million, two hundred eleven thousand, two hundred twelve".