212001221111 has 2 divisors, whose sum is σ = 212001221112. Its totient is φ = 212001221110.

The previous prime is 212001221087. The next prime is 212001221123. The reversal of 212001221111 is 111122100212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212001221111 is a prime.

It is a super-2 number, since 2×212001221111² (a number of 23 digits) contains 22 as substring.

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 (212001220111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106000610555 + 106000610556.

It is an arithmetic number, because the mean of its divisors is an integer number (106000610556).

Almost surely, 2^212001221111 is an apocalyptic number.

212001221111 is a deficient number, since it is larger than the sum of its proper divisors (1).

212001221111 is an equidigital number, since it uses as much as digits as its factorization.

212001221111 is an odious number, because the sum of its binary digits is odd.

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

Adding to 212001221111 its reverse (111122100212), we get a palindrome (323123321323).

The spelling of 212001221111 in words is "two hundred twelve billion, one million, two hundred twenty-one thousand, one hundred eleven".