20122211212111 has 16 divisors (see below), whose sum is σ = 20302786421568. Its totient is φ = 19942133587200.

The previous prime is 20122211212087. The next prime is 20122211212121. The reversal of 20122211212111 is 11121211222102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20122211212111 - 2¹⁷ = 20122211081039 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 (20122211212121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 841534246 + ... + 841558156.

It is an arithmetic number, because the mean of its divisors is an integer number (1268924151348).

Almost surely, 2^{20122211212111} is an apocalyptic number.

20122211212111 is a deficient number, since it is larger than the sum of its proper divisors (180575209457).

20122211212111 is a wasteful number, since it uses less digits than its factorization.

20122211212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34002.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 20122211212111 its reverse (11121211222102), we get a palindrome (31243422434213).

Subtracting from 20122211212111 its reverse (11121211222102), we obtain a palindrome (9000999990009).

The spelling of 20122211212111 in words is "twenty trillion, one hundred twenty-two billion, two hundred eleven million, two hundred twelve thousand, one hundred eleven".