1220120111 has 16 divisors (see below), whose sum is σ = 1403648064. Its totient is φ = 1038921984.

The previous prime is 1220120089. The next prime is 1220120113. The reversal of 1220120111 is 1110210221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220120111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220120092 and 1220120101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220120113) 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, 1390805 + ... + 1391681.

It is an arithmetic number, because the mean of its divisors is an integer number (87728004).

Almost surely, 2^1220120111 is an apocalyptic number.

1220120111 is a deficient number, since it is larger than the sum of its proper divisors (183527953).

1220120111 is an equidigital number, since it uses as much as digits as its factorization.

1220120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1970.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1220120111 is about 34930.2177347923. The cubic root of 1220120111 is about 1068.5647951660.

Adding to 1220120111 its reverse (1110210221), we get a palindrome (2330330332).

The spelling of 1220120111 in words is "one billion, two hundred twenty million, one hundred twenty thousand, one hundred eleven".