1221253043 has 8 divisors (see below), whose sum is σ = 1256349312. Its totient is φ = 1186266816.

The previous prime is 1221253031. The next prime is 1221253051. The reversal of 1221253043 is 3403521221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221253043 - 2⁶ = 1221252979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221253003) 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 7 ways as a sum of consecutive naturals, for example, 4730 + ... + 49647.

It is an arithmetic number, because the mean of its divisors is an integer number (157043664).

Almost surely, 2^1221253043 is an apocalyptic number.

1221253043 is a deficient number, since it is larger than the sum of its proper divisors (35096269).

1221253043 is an equidigital number, since it uses as much as digits as its factorization.

1221253043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55021.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1221253043 is about 34946.4310481056. The cubic root of 1221253043 is about 1068.8954283914.

Adding to 1221253043 its reverse (3403521221), we get a palindrome (4624774264).

The spelling of 1221253043 in words is "one billion, two hundred twenty-one million, two hundred fifty-three thousand, forty-three".