1220340111 has 4 divisors (see below), whose sum is σ = 1627120152. Its totient is φ = 813560072.

The previous prime is 1220340109. The next prime is 1220340133. The reversal of 1220340111 is 1110430221.

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 1220340111 - 2¹ = 1220340109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220340161) 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 3 ways as a sum of consecutive naturals, for example, 203390016 + ... + 203390021.

It is an arithmetic number, because the mean of its divisors is an integer number (406780038).

Almost surely, 2^1220340111 is an apocalyptic number.

1220340111 is a deficient number, since it is larger than the sum of its proper divisors (406780041).

1220340111 is an equidigital number, since it uses as much as digits as its factorization.

1220340111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406780040.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1220340111 is about 34933.3667286736. The cubic root of 1220340111 is about 1068.6290156541.

Adding to 1220340111 its reverse (1110430221), we get a palindrome (2330770332).

The spelling of 1220340111 in words is "one billion, two hundred twenty million, three hundred forty thousand, one hundred eleven".