1220120443 has 4 divisors (see below), whose sum is σ = 1220192320. Its totient is φ = 1220048568.

The previous prime is 1220120437. The next prime is 1220120449. The reversal of 1220120443 is 3440210221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (1220120437) and next prime (1220120449).

It is a cyclic number.

It is not a de Polignac number, because 1220120443 - 2⁹ = 1220119931 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220120443.

It is not an unprimeable number, because it can be changed into a prime (1220120449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5293 + ... + 49681.

It is an arithmetic number, because the mean of its divisors is an integer number (305048080).

Almost surely, 2^1220120443 is an apocalyptic number.

1220120443 is a deficient number, since it is larger than the sum of its proper divisors (71877).

1220120443 is an equidigital number, since it uses as much as digits as its factorization.

1220120443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71876.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1220120443 is about 34930.2224871242. Note that the first 3 decimals coincide. The cubic root of 1220120443 is about 1068.5648920864.

Adding to 1220120443 its reverse (3440210221), we get a palindrome (4660330664).

The spelling of 1220120443 in words is "one billion, two hundred twenty million, one hundred twenty thousand, four hundred forty-three".