1221445121305 has 8 divisors (see below), whose sum is σ = 1465905768192. Its totient is φ = 977041681968.

The previous prime is 1221445121279. The next prime is 1221445121317. The reversal of 1221445121305 is 5031215441221.

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 1221445121305 - 2¹⁵ = 1221445088537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14254899 + ... + 14340328.

It is an arithmetic number, because the mean of its divisors is an integer number (183238221024).

Almost surely, 2^{1221445121305} is an apocalyptic number.

It is an amenable number.

1221445121305 is a deficient number, since it is larger than the sum of its proper divisors (244460646887).

1221445121305 is an equidigital number, since it uses as much as digits as its factorization.

1221445121305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28603775.

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 1221445121305 in words is "one trillion, two hundred twenty-one billion, four hundred forty-five million, one hundred twenty-one thousand, three hundred five".