211211111022101 has 4 divisors (see below), whose sum is σ = 211211156719692. Its totient is φ = 211211065324512.

The previous prime is 211211111022097. The next prime is 211211111022127. The reversal of 211211111022101 is 101220111112112.

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 78990411399025 + 132220699623076 = 8887655^2 + 11498726^2 .

It is a cyclic number.

It is not a de Polignac number, because 211211111022101 - 2² = 211211111022097 is a prime.

It is a super-2 number, since 2×211211111022101² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 211211111022101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211211111522101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15022280 + ... + 25457633.

It is an arithmetic number, because the mean of its divisors is an integer number (52802789179923).

Almost surely, 2^{211211111022101} is an apocalyptic number.

It is an amenable number.

211211111022101 is a deficient number, since it is larger than the sum of its proper divisors (45697591).

211211111022101 is an equidigital number, since it uses as much as digits as its factorization.

211211111022101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45697590.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 211211111022101 its reverse (101220111112112), we get a palindrome (312431222134213).

The spelling of 211211111022101 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred eleven million, twenty-two thousand, one hundred one".