1445020221 has 8 divisors (see below), whose sum is σ = 1927511680. Its totient is φ = 962937792.

The previous prime is 1445020219. The next prime is 1445020253. The reversal of 1445020221 is 1220205441.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1445020221 - 2¹ = 1445020219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1445020201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93916 + ... + 108213.

It is an arithmetic number, because the mean of its divisors is an integer number (240938960).

Almost surely, 2^1445020221 is an apocalyptic number.

It is an amenable number.

1445020221 is a deficient number, since it is larger than the sum of its proper divisors (482491459).

1445020221 is a wasteful number, since it uses less digits than its factorization.

1445020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204515.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 1445020221 is about 38013.4215902752. The cubic root of 1445020221 is about 1130.5539928503.

Adding to 1445020221 its reverse (1220205441), we get a palindrome (2665225662).

The spelling of 1445020221 in words is "one billion, four hundred forty-five million, twenty thousand, two hundred twenty-one".