1211101220211 has 4 divisors (see below), whose sum is σ = 1614801626952. Its totient is φ = 807400813472.

The previous prime is 1211101220209. The next prime is 1211101220249. The reversal of 1211101220211 is 1120221011121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1211101220211 - 2¹ = 1211101220209 is a prime.

It is a super-2 number, since 2×1211101220211² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211101220611) 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, 201850203366 + ... + 201850203371.

It is an arithmetic number, because the mean of its divisors is an integer number (403700406738).

Almost surely, 2^{1211101220211} is an apocalyptic number.

1211101220211 is a deficient number, since it is larger than the sum of its proper divisors (403700406741).

1211101220211 is an equidigital number, since it uses as much as digits as its factorization.

1211101220211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403700406740.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211101220211 its reverse (1120221011121), we get a palindrome (2331322231332).

The spelling of 1211101220211 in words is "one trillion, two hundred eleven billion, one hundred one million, two hundred twenty thousand, two hundred eleven".