1220211121101 has 16 divisors (see below), whose sum is σ = 1884840142464. Its totient is φ = 687711942144.

The previous prime is 1220211121099. The next prime is 1220211121111. The reversal of 1220211121101 is 1011211120221.

It is a happy number.

It is not a de Polignac number, because 1220211121101 - 2¹ = 1220211121099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220211121111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 397979916 + ... + 397982981.

It is an arithmetic number, because the mean of its divisors is an integer number (117802508904).

Almost surely, 2^{1220211121101} is an apocalyptic number.

It is an amenable number.

1220211121101 is a deficient number, since it is larger than the sum of its proper divisors (664629021363).

1220211121101 is an equidigital number, since it uses as much as digits as its factorization.

1220211121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795962980.

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

Adding to 1220211121101 its reverse (1011211120221), we get a palindrome (2231422241322).

The spelling of 1220211121101 in words is "one trillion, two hundred twenty billion, two hundred eleven million, one hundred twenty-one thousand, one hundred one".