211001002112101 has 4 divisors (see below), whose sum is σ = 223412825765772. Its totient is φ = 198589178458432.

The previous prime is 211001002112099. The next prime is 211001002112107. The reversal of 211001002112101 is 101211200100112.

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 85851361891201 + 125149640220900 = 9265601^2 + 11187030^2 .

It is a cyclic number.

It is not a de Polignac number, because 211001002112101 - 2¹ = 211001002112099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211001002112107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6205911826810 + ... + 6205911826843.

It is an arithmetic number, because the mean of its divisors is an integer number (55853206441443).

Almost surely, 2^{211001002112101} is an apocalyptic number.

It is an amenable number.

211001002112101 is a deficient number, since it is larger than the sum of its proper divisors (12411823653671).

211001002112101 is a wasteful number, since it uses less digits than its factorization.

211001002112101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12411823653670.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 211001002112101 its reverse (101211200100112), we get a palindrome (312212202212213).

The spelling of 211001002112101 in words is "two hundred eleven trillion, one billion, two million, one hundred twelve thousand, one hundred one".