2111022221221 has 4 divisors (see below), whose sum is σ = 2111201482572. Its totient is φ = 2110842959872.

The previous prime is 2111022221177. The next prime is 2111022221293. The reversal of 2111022221221 is 1221222201112.

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 1379379780900 + 731642440321 = 1174470^2 + 855361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2111022221221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111022221821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89613010 + ... + 89636563.

It is an arithmetic number, because the mean of its divisors is an integer number (527800370643).

Almost surely, 2^{2111022221221} is an apocalyptic number.

It is an amenable number.

2111022221221 is a deficient number, since it is larger than the sum of its proper divisors (179261351).

2111022221221 is a wasteful number, since it uses less digits than its factorization.

2111022221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179261350.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 2111022221221 its reverse (1221222201112), we get a palindrome (3332244422333).

The spelling of 2111022221221 in words is "two trillion, one hundred eleven billion, twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".