211211021111201 has 4 divisors (see below), whose sum is σ = 211216488830100. Its totient is φ = 211205553392304.

The previous prime is 211211021111179. The next prime is 211211021111239. The reversal of 211211021111201 is 102111120112112.

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 93411451801600 + 117799569309601 = 9664960^2 + 10853551^2 .

It is a cyclic number.

It is not a de Polignac number, because 211211021111201 - 2³⁴ = 211193841242017 is a prime.

It is a super-2 number, since 2×211211021111201² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211211021111201.

It is not an unprimeable number, because it can be changed into a prime (211211021111281) 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, 2733801506 + ... + 2733878763.

It is an arithmetic number, because the mean of its divisors is an integer number (52804122207525).

Almost surely, 2^{211211021111201} is an apocalyptic number.

It is an amenable number.

211211021111201 is a deficient number, since it is larger than the sum of its proper divisors (5467718899).

211211021111201 is an equidigital number, since it uses as much as digits as its factorization.

211211021111201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5467718898.

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

Adding to 211211021111201 its reverse (102111120112112), we get a palindrome (313322141223313).

The spelling of 211211021111201 in words is "two hundred eleven trillion, two hundred eleven billion, twenty-one million, one hundred eleven thousand, two hundred one".