1221044147843 has 4 divisors (see below), whose sum is σ = 1314970620768. Its totient is φ = 1127117674920.

The previous prime is 1221044147819. The next prime is 1221044147849. The reversal of 1221044147843 is 3487414401221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221044147843 - 2¹⁴ = 1221044131459 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 1221044147843.

It is not an unprimeable number, because it can be changed into a prime (1221044147849) 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, 46963236443 + ... + 46963236468.

It is an arithmetic number, because the mean of its divisors is an integer number (328742655192).

Almost surely, 2^{1221044147843} is an apocalyptic number.

1221044147843 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1221044147843 is a deficient number, since it is larger than the sum of its proper divisors (93926472925).

1221044147843 is an equidigital number, since it uses as much as digits as its factorization.

1221044147843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93926472924.

The product of its (nonzero) digits is 172032, while the sum is 41.

The spelling of 1221044147843 in words is "one trillion, two hundred twenty-one billion, forty-four million, one hundred forty-seven thousand, eight hundred forty-three".