1452220221 has 4 divisors (see below), whose sum is σ = 1936293632. Its totient is φ = 968146812.

The previous prime is 1452220199. The next prime is 1452220247. The reversal of 1452220221 is 1220222541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1452220221 - 2²⁵ = 1418665789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1452220321) 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 3 ways as a sum of consecutive naturals, for example, 242036701 + ... + 242036706.

It is an arithmetic number, because the mean of its divisors is an integer number (484073408).

Almost surely, 2^1452220221 is an apocalyptic number.

It is an amenable number.

1452220221 is a deficient number, since it is larger than the sum of its proper divisors (484073411).

1452220221 is an equidigital number, since it uses as much as digits as its factorization.

1452220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484073410.

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

The square root of 1452220221 is about 38108.0073081761. The cubic root of 1452220221 is about 1132.4285932688.

Adding to 1452220221 its reverse (1220222541), we get a palindrome (2672442762).

It can be divided in two parts, 14522 and 20221, that added together give a palindrome (34743).

The spelling of 1452220221 in words is "one billion, four hundred fifty-two million, two hundred twenty thousand, two hundred twenty-one".