2212102011221 has 4 divisors (see below), whose sum is σ = 2242404778572. Its totient is φ = 2181799243872.

The previous prime is 2212102011187. The next prime is 2212102011253. The reversal of 2212102011221 is 1221102012122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1696310880625 + 515791130596 = 1302425^2 + 718186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2212102011221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2212102011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212102013221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15151383566 + ... + 15151383711.

It is an arithmetic number, because the mean of its divisors is an integer number (560601194643).

Almost surely, 2^{2212102011221} is an apocalyptic number.

It is an amenable number.

2212102011221 is a deficient number, since it is larger than the sum of its proper divisors (30302767351).

2212102011221 is an equidigital number, since it uses as much as digits as its factorization.

2212102011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30302767350.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2212102011221 its reverse (1221102012122), we get a palindrome (3433204023343).

Subtracting from 2212102011221 its reverse (1221102012122), we obtain a palindrome (990999999099).

The spelling of 2212102011221 in words is "two trillion, two hundred twelve billion, one hundred two million, eleven thousand, two hundred twenty-one".