20112222221111 has 2 divisors, whose sum is σ = 20112222221112. Its totient is φ = 20112222221110.

The previous prime is 20112222221107. The next prime is 20112222221129. The reversal of 20112222221111 is 11112222221102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20112222221111 - 2² = 20112222221107 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20112222221011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056111110555 + 10056111110556.

It is an arithmetic number, because the mean of its divisors is an integer number (10056111110556).

Almost surely, 2^{20112222221111} is an apocalyptic number.

20112222221111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20112222221111 is an equidigital number, since it uses as much as digits as its factorization.

20112222221111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 20112222221111 its reverse (11112222221102), we get a palindrome (31224444442213).

Subtracting from 20112222221111 its reverse (11112222221102), we obtain a palindrome (9000000000009).

The spelling of 20112222221111 in words is "twenty trillion, one hundred twelve billion, two hundred twenty-two million, two hundred twenty-one thousand, one hundred eleven".