1220355243001 has 4 divisors (see below), whose sum is σ = 1220586332404. Its totient is φ = 1220124153600.

The previous prime is 1220355242999. The next prime is 1220355243059. The reversal of 1220355243001 is 1003425530221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 640678579776 + 579676663225 = 800424^2 + 761365^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220355243001 - 2¹ = 1220355242999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220355244001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115536780 + ... + 115547341.

It is an arithmetic number, because the mean of its divisors is an integer number (305146583101).

Almost surely, 2^{1220355243001} is an apocalyptic number.

It is an amenable number.

1220355243001 is a deficient number, since it is larger than the sum of its proper divisors (231089403).

1220355243001 is an equidigital number, since it uses as much as digits as its factorization.

1220355243001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231089402.

The product of its (nonzero) digits is 7200, while the sum is 28.

The spelling of 1220355243001 in words is "one trillion, two hundred twenty billion, three hundred fifty-five million, two hundred forty-three thousand, one".