1211000110221 has 16 divisors (see below), whose sum is σ = 1761592368960. Its totient is φ = 733882101120.

The previous prime is 1211000110207. The next prime is 1211000110249. The reversal of 1211000110221 is 1220110001121.

It is not a de Polignac number, because 1211000110221 - 2¹⁴ = 1211000093837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211000110197 and 1211000110206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211000120221) 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 15 ways as a sum of consecutive naturals, for example, 1003416 + ... + 1851713.

It is an arithmetic number, because the mean of its divisors is an integer number (110099523060).

Almost surely, 2^{1211000110221} is an apocalyptic number.

1211000110221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211000110221 is a deficient number, since it is larger than the sum of its proper divisors (550592258739).

1211000110221 is a wasteful number, since it uses less digits than its factorization.

1211000110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2867996.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1211000110221 its reverse (1220110001121), we get a palindrome (2431110111342).

The spelling of 1211000110221 in words is "one trillion, two hundred eleven billion, one hundred ten thousand, two hundred twenty-one".