211130021909 has 2 divisors, whose sum is σ = 211130021910. Its totient is φ = 211130021908.

The previous prime is 211130021897. The next prime is 211130022041. The reversal of 211130021909 is 909120031112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147842557009 + 63287464900 = 384503^2 + 251570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211130021909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211130026909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105565010954 + 105565010955.

It is an arithmetic number, because the mean of its divisors is an integer number (105565010955).

Almost surely, 2^211130021909 is an apocalyptic number.

It is an amenable number.

211130021909 is a deficient number, since it is larger than the sum of its proper divisors (1).

211130021909 is an equidigital number, since it uses as much as digits as its factorization.

211130021909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 29.

The spelling of 211130021909 in words is "two hundred eleven billion, one hundred thirty million, twenty-one thousand, nine hundred nine".