212111019917 has 2 divisors, whose sum is σ = 212111019918. Its totient is φ = 212111019916.

The previous prime is 212111019811. The next prime is 212111020013. The reversal of 212111019917 is 719910111212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130421377321 + 81689642596 = 361139^2 + 285814^2 .

It is a cyclic number.

It is not a de Polignac number, because 212111019917 - 2¹⁰ = 212111018893 is a prime.

It is a super-3 number, since 3×212111019917³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212116019917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106055509958 + 106055509959.

It is an arithmetic number, because the mean of its divisors is an integer number (106055509959).

Almost surely, 2^212111019917 is an apocalyptic number.

It is an amenable number.

212111019917 is a deficient number, since it is larger than the sum of its proper divisors (1).

212111019917 is an equidigital number, since it uses as much as digits as its factorization.

212111019917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 35.

The spelling of 212111019917 in words is "two hundred twelve billion, one hundred eleven million, nineteen thousand, nine hundred seventeen".