1221601445459 has 4 divisors (see below), whose sum is σ = 1221635436504. Its totient is φ = 1221567454416.

The previous prime is 1221601445453. The next prime is 1221601445479. The reversal of 1221601445459 is 9545441061221.

It is a happy number.

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 1221601445459 - 2³⁶ = 1152881968723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221601445453) 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, 16941557 + ... + 17013510.

It is an arithmetic number, because the mean of its divisors is an integer number (305408859126).

Almost surely, 2^{1221601445459} is an apocalyptic number.

1221601445459 is a deficient number, since it is larger than the sum of its proper divisors (33991045).

1221601445459 is an equidigital number, since it uses as much as digits as its factorization.

1221601445459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33991044.

The product of its (nonzero) digits is 345600, while the sum is 44.

The spelling of 1221601445459 in words is "one trillion, two hundred twenty-one billion, six hundred one million, four hundred forty-five thousand, four hundred fifty-nine".