211220102189 has 2 divisors, whose sum is σ = 211220102190. Its totient is φ = 211220102188.

The previous prime is 211220102179. The next prime is 211220102239. The reversal of 211220102189 is 981201022112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210602977225 + 617124964 = 458915^2 + 24842^2 .

It is a cyclic number.

It is not a de Polignac number, because 211220102189 - 2⁸ = 211220101933 is a prime.

It is a super-2 number, since 2×211220102189² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211220102179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610051094 + 105610051095.

It is an arithmetic number, because the mean of its divisors is an integer number (105610051095).

Almost surely, 2^211220102189 is an apocalyptic number.

It is an amenable number.

211220102189 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220102189 is an equidigital number, since it uses as much as digits as its factorization.

211220102189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 29.

The spelling of 211220102189 in words is "two hundred eleven billion, two hundred twenty million, one hundred two thousand, one hundred eighty-nine".