211112211022001 has 4 divisors (see below), whose sum is σ = 211112262044004. Its totient is φ = 211112160000000.

The previous prime is 211112211021997. The next prime is 211112211022061. The reversal of 211112211022001 is 100220112211112.

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 118687079809600 + 92425131212401 = 10894360^2 + 9613799^2 .

It is a cyclic number.

It is not a de Polignac number, because 211112211022001 - 2² = 211112211021997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (211112211022061) 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, 18698000 + ... + 27782001.

It is an arithmetic number, because the mean of its divisors is an integer number (52778065511001).

Almost surely, 2^{211112211022001} is an apocalyptic number.

It is an amenable number.

211112211022001 is a deficient number, since it is larger than the sum of its proper divisors (51022003).

211112211022001 is an equidigital number, since it uses as much as digits as its factorization.

211112211022001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51022002.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 211112211022001 its reverse (100220112211112), we get a palindrome (311332323233113).

The spelling of 211112211022001 in words is "two hundred eleven trillion, one hundred twelve billion, two hundred eleven million, twenty-two thousand, one".