1220445403221 has 16 divisors (see below), whose sum is σ = 1836406877760. Its totient is φ = 714158229120.

The previous prime is 1220445403187. The next prime is 1220445403253. The reversal of 1220445403221 is 1223045440221.

It is a happy number.

It is not a de Polignac number, because 1220445403221 - 2²⁷ = 1220311185493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220445403291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 637640320 + ... + 637642233.

It is an arithmetic number, because the mean of its divisors is an integer number (114775429860).

Almost surely, 2^{1220445403221} is an apocalyptic number.

1220445403221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220445403221 is a deficient number, since it is larger than the sum of its proper divisors (615961474539).

1220445403221 is a wasteful number, since it uses less digits than its factorization.

1220445403221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275282596.

The product of its (nonzero) digits is 15360, while the sum is 30.

The spelling of 1220445403221 in words is "one trillion, two hundred twenty billion, four hundred forty-five million, four hundred three thousand, two hundred twenty-one".