1221434043 has 16 divisors (see below), whose sum is σ = 1638213120. Its totient is φ = 809486496.

The previous prime is 1221434033. The next prime is 1221434083. The reversal of 1221434043 is 3404341221.

It is a de Polignac number, because none of the positive numbers 2^k-1221434043 is a prime.

It is a super-2 number, since 2×1221434043² = 2983802242798651698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221434033) 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 15 ways as a sum of consecutive naturals, for example, 440046 + ... + 442812.

It is an arithmetic number, because the mean of its divisors is an integer number (102388320).

Almost surely, 2^1221434043 is an apocalyptic number.

1221434043 is a deficient number, since it is larger than the sum of its proper divisors (416779077).

1221434043 is a wasteful number, since it uses less digits than its factorization.

1221434043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3586.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 1221434043 is about 34949.0206300549. The cubic root of 1221434043 is about 1068.9482322217.

Adding to 1221434043 its reverse (3404341221), we get a palindrome (4625775264).

The spelling of 1221434043 in words is "one billion, two hundred twenty-one million, four hundred thirty-four thousand, forty-three".