20211111122111 has 32 divisors (see below), whose sum is σ = 25177784056320. Its totient is φ = 15796743202944.

The previous prime is 20211111122047. The next prime is 20211111122173. The reversal of 20211111122111 is 11122111111202.

It is a cyclic number.

It is not a de Polignac number, because 20211111122111 - 2⁶ = 20211111122047 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20211111122111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211111122011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68153825 + ... + 68449733.

It is an arithmetic number, because the mean of its divisors is an integer number (786805751760).

Almost surely, 2^{20211111122111} is an apocalyptic number.

20211111122111 is a deficient number, since it is larger than the sum of its proper divisors (4966672934209).

20211111122111 is a wasteful number, since it uses less digits than its factorization.

20211111122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305055.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 20211111122111 its reverse (11122111111202), we get a palindrome (31333222233313).

The spelling of 20211111122111 in words is "twenty trillion, two hundred eleven billion, one hundred eleven million, one hundred twenty-two thousand, one hundred eleven".