211220101011209 has 2 divisors, whose sum is σ = 211220101011210. Its totient is φ = 211220101011208.

The previous prime is 211220101011169. The next prime is 211220101011211. The reversal of 211220101011209 is 902110101022112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192826467122809 + 18393633888400 = 13886197^2 + 4288780^2 .

It is a cyclic number.

It is not a de Polignac number, because 211220101011209 - 2¹⁶ = 211220100945673 is a prime.

It is a super-2 number, since 2×211220101011209² (a number of 29 digits) contains 22 as substring.

Together with 211220101011211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211220101011239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610050505604 + 105610050505605.

It is an arithmetic number, because the mean of its divisors is an integer number (105610050505605).

Almost surely, 2^{211220101011209} is an apocalyptic number.

It is an amenable number.

211220101011209 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220101011209 is an equidigital number, since it uses as much as digits as its factorization.

211220101011209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 211220101011209 in words is "two hundred eleven trillion, two hundred twenty billion, one hundred one million, eleven thousand, two hundred nine".