1221120443 has 4 divisors (see below), whose sum is σ = 1285389960. Its totient is φ = 1156850928.

The previous prime is 1221120427. The next prime is 1221120479. The reversal of 1221120443 is 3440211221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3440211221 = 2113 ⋅1628117.

It is a cyclic number.

It is not a de Polignac number, because 1221120443 - 2⁴ = 1221120427 is a prime.

It is a super-2 number, since 2×1221120443² = 2982270272625032498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221120643) 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, 32134730 + ... + 32134767.

It is an arithmetic number, because the mean of its divisors is an integer number (321347490).

Almost surely, 2^1221120443 is an apocalyptic number.

1221120443 is a deficient number, since it is larger than the sum of its proper divisors (64269517).

1221120443 is an equidigital number, since it uses as much as digits as its factorization.

1221120443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64269516.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1221120443 is about 34944.5338071636. The cubic root of 1221120443 is about 1068.8567411691.

Adding to 1221120443 its reverse (3440211221), we get a palindrome (4661331664).

The spelling of 1221120443 in words is "one billion, two hundred twenty-one million, one hundred twenty thousand, four hundred forty-three".