20212111 has 2 divisors, whose sum is σ = 20212112. Its totient is φ = 20212110.

The previous prime is 20212103. The next prime is 20212117. The reversal of 20212111 is 11121202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20212111 - 2³ = 20212103 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106055 + 10106056.

It is an arithmetic number, because the mean of its divisors is an integer number (10106056).

Almost surely, 2^20212111 is an apocalyptic number.

20212111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212111 is an equidigital number, since it uses as much as digits as its factorization.

20212111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 20212111 is about 4495.7881400262. The cubic root of 20212111 is about 272.3979855495.

Adding to 20212111 its reverse (11121202), we get a palindrome (31333313).

Subtracting from 20212111 its reverse (11121202), we obtain a palindrome (9090909).

The spelling of 20212111 in words is "twenty million, two hundred twelve thousand, one hundred eleven".