2111222122221 has 4 divisors (see below), whose sum is σ = 2814962829632. Its totient is φ = 1407481414812.

The previous prime is 2111222122193. The next prime is 2111222122223. The reversal of 2111222122221 is 1222212221112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2111222122221 - 2²⁷ = 2111087904493 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 (2111222122223) 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, 351870353701 + ... + 351870353706.

It is an arithmetic number, because the mean of its divisors is an integer number (703740707408).

Almost surely, 2^{2111222122221} is an apocalyptic number.

It is an amenable number.

2111222122221 is a deficient number, since it is larger than the sum of its proper divisors (703740707411).

2111222122221 is an equidigital number, since it uses as much as digits as its factorization.

2111222122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703740707410.

The product of its digits is 256, while the sum is 21.

Adding to 2111222122221 its reverse (1222212221112), we get a palindrome (3333434343333).

The spelling of 2111222122221 in words is "two trillion, one hundred eleven billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred twenty-one".