212101031 has 2 divisors, whose sum is σ = 212101032. Its totient is φ = 212101030.

The previous prime is 212101013. The next prime is 212101079. The reversal of 212101031 is 130101212.

Together with previous prime (212101013) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212101031 - 2¹⁴ = 212084647 is a prime.

It is a super-2 number, since 2×212101031² = 89973694702525922, which contains 22 as substring.

It is a Sophie Germain 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 (212101831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106050515 + 106050516.

It is an arithmetic number, because the mean of its divisors is an integer number (106050516).

Almost surely, 2^212101031 is an apocalyptic number.

212101031 is a deficient number, since it is larger than the sum of its proper divisors (1).

212101031 is an equidigital number, since it uses as much as digits as its factorization.

212101031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 212101031 is about 14563.6887840959. The cubic root of 212101031 is about 596.3679009789.

Adding to 212101031 its reverse (130101212), we get a palindrome (342202243).

The spelling of 212101031 in words is "two hundred twelve million, one hundred one thousand, thirty-one".