212101821413 has 2 divisors, whose sum is σ = 212101821414. Its totient is φ = 212101821412.

The previous prime is 212101821343. The next prime is 212101821431. The reversal of 212101821413 is 314128101212.

Together with next prime (212101821431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198276059524 + 13825761889 = 445282^2 + 117583^2 .

It is a cyclic number.

It is not a de Polignac number, because 212101821413 - 2⁸ = 212101821157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212101821313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106050910706 + 106050910707.

It is an arithmetic number, because the mean of its divisors is an integer number (106050910707).

Almost surely, 2^212101821413 is an apocalyptic number.

It is an amenable number.

212101821413 is a deficient number, since it is larger than the sum of its proper divisors (1).

212101821413 is an equidigital number, since it uses as much as digits as its factorization.

212101821413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 26.

Adding to 212101821413 its reverse (314128101212), we get a palindrome (526229922625).

The spelling of 212101821413 in words is "two hundred twelve billion, one hundred one million, eight hundred twenty-one thousand, four hundred thirteen".