211100010101 has 4 divisors (see below), whose sum is σ = 223517657772. Its totient is φ = 198682362432.

The previous prime is 211100010071. The next prime is 211100010227. The reversal of 211100010101 is 101010001112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 179797200625 + 31302809476 = 424025^2 + 176926^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211100010101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211100010301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6208823810 + ... + 6208823843.

It is an arithmetic number, because the mean of its divisors is an integer number (55879414443).

Almost surely, 2^211100010101 is an apocalyptic number.

It is an amenable number.

211100010101 is a deficient number, since it is larger than the sum of its proper divisors (12417647671).

211100010101 is a wasteful number, since it uses less digits than its factorization.

211100010101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12417647670.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 211100010101 its reverse (101010001112), we get a palindrome (312110011213).

The spelling of 211100010101 in words is "two hundred eleven billion, one hundred million, ten thousand, one hundred one".