211212111101 has 4 divisors (see below), whose sum is σ = 211886910492. Its totient is φ = 210537311712.

The previous prime is 211212111083. The next prime is 211212111113. The reversal of 211212111101 is 101111212112.

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 69828591001 + 141383520100 = 264251^2 + 376010^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211212111101 is a prime.

It is a super-2 number, since 2×211212111101² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212111181) 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, 337399226 + ... + 337399851.

It is an arithmetic number, because the mean of its divisors is an integer number (52971727623).

Almost surely, 2^211212111101 is an apocalyptic number.

It is an amenable number.

211212111101 is a deficient number, since it is larger than the sum of its proper divisors (674799391).

211212111101 is an equidigital number, since it uses as much as digits as its factorization.

211212111101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674799390.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 211212111101 its reverse (101111212112), we get a palindrome (312323323213).

The spelling of 211212111101 in words is "two hundred eleven billion, two hundred twelve million, one hundred eleven thousand, one hundred one".