1221130443 has 16 divisors (see below), whose sum is σ = 1754063136. Its totient is φ = 751188480.

The previous prime is 1221130403. The next prime is 1221130447. The reversal of 1221130443 is 3440311221.

It is not a de Polignac number, because 1221130443 - 2¹⁶ = 1221064907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221130447) 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, 167923 + ... + 175043.

It is an arithmetic number, because the mean of its divisors is an integer number (109628946).

Almost surely, 2^1221130443 is an apocalyptic number.

1221130443 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1221130443 is a deficient number, since it is larger than the sum of its proper divisors (532932693).

1221130443 is a wasteful number, since it uses less digits than its factorization.

1221130443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11534.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1221130443 is about 34944.6768907655. The cubic root of 1221130443 is about 1068.8596588551.

Adding to 1221130443 its reverse (3440311221), we get a palindrome (4661441664).

The spelling of 1221130443 in words is "one billion, two hundred twenty-one million, one hundred thirty thousand, four hundred forty-three".