211211110002001 has 4 divisors (see below), whose sum is σ = 211216762080100. Its totient is φ = 211205457923904.

The previous prime is 211211110001933. The next prime is 211211110002019. The reversal of 211211110002001 is 100200011112112.

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 75574247289025 + 135636862712976 = 8693345^2 + 11646324^2 .

It is a cyclic number.

It is not a de Polignac number, because 211211110002001 - 2¹⁹ = 211211109477713 is a prime.

It is a super-2 number, since 2×211211110002001² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211211110002601) 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, 2825982996 + ... + 2826057733.

It is an arithmetic number, because the mean of its divisors is an integer number (52804190520025).

Almost surely, 2^{211211110002001} is an apocalyptic number.

It is an amenable number.

211211110002001 is a deficient number, since it is larger than the sum of its proper divisors (5652078099).

211211110002001 is an equidigital number, since it uses as much as digits as its factorization.

211211110002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5652078098.

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

Adding to 211211110002001 its reverse (100200011112112), we get a palindrome (311411121114113).

The spelling of 211211110002001 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred ten million, two thousand, one".