20212211111 has 2 divisors, whose sum is σ = 20212211112. Its totient is φ = 20212211110.

The previous prime is 20212211099. The next prime is 20212211161. The reversal of 20212211111 is 11111221202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20212211111 - 2²⁶ = 20145102247 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212211161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106105555 + 10106105556.

It is an arithmetic number, because the mean of its divisors is an integer number (10106105556).

Almost surely, 2^20212211111 is an apocalyptic number.

20212211111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212211111 is an equidigital number, since it uses as much as digits as its factorization.

20212211111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20212211111 its reverse (11111221202), we get a palindrome (31323432313).

The spelling of 20212211111 in words is "twenty billion, two hundred twelve million, two hundred eleven thousand, one hundred eleven".