1211120020111 has 16 divisors (see below), whose sum is σ = 1233818961984. Its totient is φ = 1188598904064.

The previous prime is 1211120020079. The next prime is 1211120020147. The reversal of 1211120020111 is 1110200211121.

It is a happy number.

It is not a de Polignac number, because 1211120020111 - 2⁵ = 1211120020079 is a prime.

It is a super-2 number, since 2×1211120020111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211120020091 and 1211120020100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211120027111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13794925 + ... + 13882441.

It is an arithmetic number, because the mean of its divisors is an integer number (77113685124).

Almost surely, 2^{1211120020111} is an apocalyptic number.

1211120020111 is a deficient number, since it is larger than the sum of its proper divisors (22698941873).

1211120020111 is an equidigital number, since it uses as much as digits as its factorization.

1211120020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88530.

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

Adding to 1211120020111 its reverse (1110200211121), we get a palindrome (2321320231232).

The spelling of 1211120020111 in words is "one trillion, two hundred eleven billion, one hundred twenty million, twenty thousand, one hundred eleven".