212101101209 has 2 divisors, whose sum is σ = 212101101210. Its totient is φ = 212101101208.

The previous prime is 212101101151. The next prime is 212101101241. The reversal of 212101101209 is 902101101212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133263692809 + 78837408400 = 365053^2 + 280780^2 .

It is a cyclic number.

It is not a de Polignac number, because 212101101209 - 2²⁸ = 211832665753 is a prime.

It is a super-2 number, since 2×212101101209² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212101101269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106050550604 + 106050550605.

It is an arithmetic number, because the mean of its divisors is an integer number (106050550605).

Almost surely, 2^212101101209 is an apocalyptic number.

It is an amenable number.

212101101209 is a deficient number, since it is larger than the sum of its proper divisors (1).

212101101209 is an equidigital number, since it uses as much as digits as its factorization.

212101101209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 212101101209 in words is "two hundred twelve billion, one hundred one million, one hundred one thousand, two hundred nine".