211101201989 has 2 divisors, whose sum is σ = 211101201990. Its totient is φ = 211101201988.

The previous prime is 211101201931. The next prime is 211101202027. The reversal of 211101201989 is 989102101112.

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., 211086951364 + 14250625 = 459442^2 + 3775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211101201989 is a prime.

It is a super-2 number, since 2×211101201989² (a number of 23 digits) contains 22 as substring.

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 (211101201919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105550600994 + 105550600995.

It is an arithmetic number, because the mean of its divisors is an integer number (105550600995).

Almost surely, 2^211101201989 is an apocalyptic number.

It is an amenable number.

211101201989 is a deficient number, since it is larger than the sum of its proper divisors (1).

211101201989 is an equidigital number, since it uses as much as digits as its factorization.

211101201989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 35.

The spelling of 211101201989 in words is "two hundred eleven billion, one hundred one million, two hundred one thousand, nine hundred eighty-nine".