212001011111 has 2 divisors, whose sum is σ = 212001011112. Its totient is φ = 212001011110.

The previous prime is 212001010999. The next prime is 212001011113. The reversal of 212001011111 is 111110100212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212001011111 - 2²² = 211996816807 is a prime.

Together with 212001011113, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 212001011092 and 212001011101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212001011113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106000505555 + 106000505556.

It is an arithmetic number, because the mean of its divisors is an integer number (106000505556).

Almost surely, 2^212001011111 is an apocalyptic number.

212001011111 is a deficient number, since it is larger than the sum of its proper divisors (1).

212001011111 is an equidigital number, since it uses as much as digits as its factorization.

212001011111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 212001011111 its reverse (111110100212), we get a palindrome (323111111323).

The spelling of 212001011111 in words is "two hundred twelve billion, one million, eleven thousand, one hundred eleven".